All links (546)

• Velero Docs - Overview (velero.io) reference
  backup, restore and migration of Kubernetes cluster resources and persistent volumes, cloud or on-prem
  Backup Disaster Recovery Kubernetes #
• buildah.io (buildah.io) tool
  Daemonless OCI image building without a full container engine; containers org project, release news
  Command Line Container Container Runtime #
• Introduction | Podman Desktop (podman-desktop.io) reference
  GUI for containers, pods and local Kubernetes on Linux, macOS and Windows, with Docker migration notes
  Container Kubernetes #
• Home (Docker Documentation) reference
  engine and CLI, image building, Desktop VMM on Mac/Windows, sandboxes and hardened image catalogue
  Container Container Runtime #
• Docker Compose Specification (compose-spec.io) reference
  vendor-neutral YAML standard for declaring multi-container applications, shared beyond Docker
  Container Infrastructure As Code #
• OpenStack Docs: 2026.1 (docs.openstack.org) reference
  OpenStack 2026.1 install, deployment, operations, high-availability and security guides for datacenter IaaS
  OpenStack Private Cloud System Administration #
• OpenStack Installation Guide — Installation Guide documentation (docs.openstack.org) tutorial
  node-by-node manual install of core OpenStack services on RHEL/CentOS or Ubuntu, per release
  OpenStack Private Cloud System Administration #
• OpenInfra Foundation: We build communities who write software that runs in production (openinfra.org) organisation
  steward of OpenStack and related open infrastructure projects, run on its Four Opens principles
  Governance Nonprofit OpenStack #
• OpenStack Compute (nova) — nova 33.1.0.dev341 documentation (docs.openstack.org) reference
  OpenStack compute service for VMs and bare metal; needs Keystone, Glance, Neutron and Placement
  OpenStack Private Cloud Virtualization #
• Welcome to Neutron’s documentation! — Neutron 29.0.0.0b2.dev121 documentation (docs.openstack.org) reference
  OpenStack network-connectivity-as-a-service: API, OVN driver, config and CLI reference
  Network Routing OpenStack Private Cloud #
• OpenStack Block Storage (Cinder) documentation — cinder 28.1.0.dev232 documentation (docs.openstack.org) reference
  OpenStack block storage service: volumes for Nova VMs, Ironic hosts and containers via REST API, CLI, Horizon
  Block Storage OpenStack Private Cloud #
• Welcome to Swift’s documentation! — Swift 2.38.1.dev87 documentation (docs.openstack.org) reference
  OpenStack's eventually consistent object/blob store: replication, REST API, S3 compatibility
  High Availability Object Storage OpenStack #
• Keystone, the OpenStack Identity Service — keystone 29.1.0.dev64 documentation (docs.openstack.org) reference
  OpenStack identity service: API client authentication, service discovery, multi-tenant authorization
  Authentication OpenStack Private Cloud #
• Welcome to Glance’s documentation! — glance 33.0.0.0b3.dev38 documentation (docs.openstack.org) reference
  OpenStack image service: registering, discovering and retrieving VM images, metadefs catalog
  OpenStack Private Cloud Virtualization #
• Horizon: The OpenStack Dashboard Project — horizon 26.0.1.dev42 documentation (docs.openstack.org) reference
  OpenStack's web dashboard fronting Nova, Swift and Keystone; usage plus writing your own panels
  OpenStack Private Cloud Web Application #
• Welcome to Ironic’s documentation! — ironic 38.0.1.dev77 documentation (docs.openstack.org) reference
  OpenStack bare-metal service driving PXE and IPMI to provision physical servers, usable standalone
  Bare Metal Provisioning OpenStack Private Cloud #
• Welcome to the Heat documentation! — openstack-heat 26.1.0.dev107 documentation (docs.openstack.org) reference
  template-driven orchestration of OpenStack resources: stacks, autoscaling, nested stacks, plugins
  Infrastructure As Code OpenStack Private Cloud #
• DevStack — DevStack documentation (docs.openstack.org) tutorial
  Scripts standing up a whole OpenStack from git master on one host; dev and test only, rewrites the box
  Interactive Lab OpenStack Private Cloud #
• Welcome to Kolla Ansible’s documentation! — kolla-ansible 22.1.0.dev193 documentation (docs.openstack.org) reference
  deploying OpenStack from production-ready containers via Ansible; opinionated but customisable
  Ansible Container OpenStack Private Cloud #
• Apache CloudStack | Apache CloudStack (cloudstack.apache.org) tool
  turnkey IaaS orchestration for large VM and bare-metal estates: networking, accounts, quotas, API
  Bare Metal Provisioning Private Cloud Virtualization #
• OpenNebula: The Open Platform for Sovereign Cloud Infrastructure (OpenNebula – Open Source Cloud & Edge Computing Platform) tool
  VMware replacement for private and edge clouds: hypervisor ops, HA, federation; paid subscription
  Commercial Support Private Cloud Virtualization #
• Proxmox VE Documentation Index (pve.proxmox.com) reference
  admin guide, man pages and API viewer for Proxmox VE's KVM and LXC virtualisation
  Container Homelab Virtualization #
• XCP-ng documentation | XCP-ng Documentation (docs.xcp-ng.org) reference
  Xen-based enterprise hypervisor, XenServer's open successor: host and pool admin, Packer/Terraform/Ansible
  Private Cloud Virtualization #
• libvirt: The virtualization API (libvirt.org) tool
  C/Python/Perl/Go API and daemon driving KVM, QEMU, Xen, LXC, bhyve and ESX; XML schema docs
  System Administration Virtualization #
• QEMU documentation - QEMU (qemu.org) reference
  docs index for the machine emulator and KVM hypervisor, mostly generated from the git tree
  Hardware Virtualization #
• Documentation | Vagrant | HashiCorp Developer (Documentation | Vagrant | HashiCorp Developer) reference
  Vagrantfile-driven throwaway VMs: boxes, provisioners, synced folders, networking, box registry
  Configuration Management Infrastructure As Code Virtualization #
• Access Cloud Services for Free (oracle.com) tool
  Always Free OCI compute and storage with no time limit, plus a 30-day US$300 trial credit
  Free Tier Public Cloud #
• Oracle VirtualBox (virtualbox.org) tool
  x86_64 desktop-to-server type-2 hypervisor, GPL and free, Oracle-backed, also macOS/Windows on Arm
  Homelab Virtualization #
• Free Cloud Computing Services - AWS Free Tier (Amazon Web Services, Inc.) reference
  what AWS gives away: 30+ always-free services within monthly limits, plus $200 new-account credits
  Free Tier Public Cloud #
• Free Trial and Free Tier Services and Products (Google Cloud) reference
  What GCP gives away: $300 trial credit plus 20+ always-free monthly limits, e2-micro to 1 TB BigQuery
  Free Tier Public Cloud #
• Explore Free Azure Services | Microsoft Azure (azure.microsoft.com) reference
  which Azure services are always free versus free for 12 new-customer months, plus $100 credit
  Free Tier Public Cloud #
• Free Plan Overview (cloudflare.com) organisation
  what Cloudflare hands out at no cost: DDoS protection, CDN, DNS, TLS and basic load balancing
  Caching DNS Free Tier TLS #
• Hetzner Docs (docs.hetzner.com) reference
  guides for Hetzner Cloud, dedicated servers, Robot, DNS and Storage Boxes; low-cost EU hosting
  Public Cloud System Administration #
• Fly.io Resource Pricing (Fly) reference
  usage-based billing for Fly.io machines and resources, per organisation; card on file required
  Free Tier Public Cloud #
• Pricing and Plans | Netlify (Netlify) reference
  credit-metered static and serverless hosting plans: compute, bandwidth, requests; free Starter tier
  Continuous Integration Free Tier Public Cloud #
• Packer documentation | Packer | HashiCorp Developer (Packer documentation | Packer | HashiCorp Developer) reference
  Builds identical golden machine images for many platforms from one template, plugin-driven
  Bare Metal Provisioning Infrastructure As Code Virtualization #
• Terraform overview | Terraform | HashiCorp Developer (Terraform overview | Terraform | HashiCorp Developer) reference
  declarative provisioning across cloud providers: HCL, CLI and state; BUSL licensed, HCP tiers above it
  Configuration Management Infrastructure As Code Public Cloud #
• Crossplane Is the Cloud-Native Framework for Platform Engineering (crossplane.io) tool
  Kubernetes-based control planes exposing custom APIs that provision cloud resources; CNCF project
  Infrastructure As Code Kubernetes Kubernetes Operator Public Cloud #
• MAAS documentation (MAAS) reference
  bare-metal provisioning at scale: hardware discovery, integrated DNS/DHCP, image deployment, API-driven
  Bare Metal Provisioning Private Cloud Ubuntu #
• Red Hat Customer Portal (Red Hat Customer Portal) reference
  subscriber entry point: knowledgebase solutions, downloads, support cases, subscription management
  Commercial Support Enterprise Linux Red Hat #
• Experience Red Hat Enterprise Linux | Red Hat interactive labs (redhat.com) tutorial
  no-cost browser sandboxes for RHEL: dnf/rpm, SELinux, crypto policy, firewall via Ansible system roles
  Enterprise Linux Free Tier Interactive Lab Red Hat #
• The official Red Hat blog (redhat.com) news
  Red Hat's own posts on RHEL, OpenShift, automation, edge and security; carries Enable Sysadmin
  Enterprise Linux Red Hat System Administration #
• Red Hat Lightspeed (redhat.com) tool
  hosted risk prediction and drift detection across RHEL, OpenShift and Ansible, formerly Insights
  Enterprise Linux Observability Patch Management Red Hat #
• Red Hat Satellite (redhat.com) tool
  provisioning, patching, errata and subscription lifecycle for RHEL fleets; paid Red Hat product
  Commercial Support Enterprise Linux Patch Management Red Hat #
• Home | Linux System Roles (linux-system-roles.github.io) tool
  Ansible roles giving a stable interface to OS subsystems; upstream of RHEL System Roles, on Galaxy
  Ansible Configuration Management Enterprise Linux Red Hat #
• Cockpit Project (Cockpit Project) tool
  web console for single Linux servers: containers, storage, network, logs, built-in terminal; LGPL
  System Administration Web Application #
• Foreman (theforeman.org) tool
  provisioning and lifecycle of bare-metal and cloud hosts: Puppet/Salt ENC, host groups, RBAC, Hammer CLI, API
  Bare Metal Provisioning Configuration Management System Administration #
• rpm.org - Home (rpm.org) tool
  Home of RPM: building, installing, querying and verifying packages, plus release and CVE news
  Package Manager RPM #
• RPM Packaging Guide (rpm-packaging-guide.github.io) tutorial
  writing spec files and building RPMs, from no packaging background through advanced cases; free
  Build From Source Package Manager RPM #
• DNF, the next-generation replacement for YUM — DNF @DNF_VERSION@-1 documentation (dnf.readthedocs.io) reference
  YUM successor for RPM systems: command, config and API reference, plugins, automatic updates
  Fedora Package Manager RPM #
• EPEL (docs.fedoraproject.org) reference
  Extra Packages for Enterprise Linux: community RPMs for RHEL and rebuilds
  Enterprise Linux Package Manager RPM #
• Copr (copr.fedorainfracloud.org) tool
  Fedora's free build service for personal and community RPM repositories
  Fedora Package Manager RPM #
• CentOS Stream - The CentOS Project (centos.org) tool
  continuously delivered midstream between Fedora and RHEL, tracking just ahead of RHEL development
  Distro Enterprise Linux Fedora #
• Welcome to Anaconda’s documentation! — Anaconda 45.20 documentation (anaconda-installer.readthedocs.io) reference
  installer behind Fedora and RHEL: kickstart automation, %post scripting, user and developer guides
  Bare Metal Provisioning Enterprise Linux Fedora #
• Welcome to Pykickstart’s documentation! — Pykickstart 3.77 documentation (pykickstart.readthedocs.io) reference
  Kickstart file syntax for unattended Fedora and RHEL installs, with pre/post scripts and examples
  Bare Metal Provisioning Fedora Red Hat #
• About AlmaLinux Wiki | AlmaLinux Wiki (wiki.almalinux.org) reference
  Docs hub for the forever-free RHEL-binary-compatible rebuild, run by a non-profit foundation
  Distro Enterprise Linux Nonprofit #
• Oracle Linux - Oracle Linux (Oracle Help Center) reference
  release documentation for Oracle Linux and the Unbreakable Enterprise Kernel
  Distro Enterprise Linux System Administration #
• Oracle Linux (oracle.com) tool
  RHEL-compatible distro free to download, use and redistribute, with paid Premier Support alongside
  Commercial Support Distro Enterprise Linux Free Tier #
• Oracle Linux Yum Server (yum.oracle.com) reference
  no-cost public RPM repositories for Oracle Linux plus EPEL, ISO verification and install notes
  Enterprise Linux Free Tier Package Manager RPM #
• https://docs.aws.amazon.com/linux/ (docs.aws.amazon.com) reference
  AL2023 user guide and release notes for AWS's RPM-based distribution, plus legacy AL2 and AL1
  Distro Public Cloud RPM #
• SUSE - Open Source Solutions for Enterprise Servers & Cloud (documentation.suse.com) reference
  SLES 16 doc set: release notes, package lifecycles, Agama installer, SELinux, PXE deploy, SLES 15 migration
  Enterprise Linux SUSE System Administration #
• Evaluation Copy of SUSE Linux Enterprise Server | SUSE (suse.com) organisation
  SLES evaluation images and update channels, gated behind a no-cost Customer Center registration
  Enterprise Linux Free Tier SUSE #
• Ubuntu Pro | Ubuntu (Ubuntu) organisation
  Canonical's security and compliance subscription: 10-year LTS coverage, free for personal use on 5 machines
  Commercial Support Free Tier Patch Management Ubuntu #
• The Debian Administrator's Handbook (debian.org) reference
  Full book text for Debian Bullseye administration, dual CC BY-SA and GPL licensed, free to read
  Debian System Administration #
• Home | OpenSCAP portal (open-scap.org) tool
  NIST-certified SCAP tooling to assess and enforce security baselines, with community hardening guides
  Security Compliance Security Hardening Vulnerability #
• GitHub - ComplianceAsCode/content: Security automation content in SCAP, Bash, Ansible, and other formats (GitHub) repo
  SCAP/XCCDF/OVAL hardening profiles with generated Ansible and bash remediation for RHEL, Ubuntu, SLES
  Ansible Enterprise Linux Security Compliance Security Hardening #
• CIS Benchmarks® (CIS) reference
  consensus hardening baselines for 25+ product families; free PDFs, tailoring needs paid membership
  Free Tier Security Compliance Security Hardening #
• DISA STIGs (cyber.mil) reference
  US DoD Security Technical Implementation Guides, free public downloads
  Security Compliance Security Hardening #
• AIDE - Advanced Intrusion Detection Environment (aide.github.io) tool
  File and directory integrity checker: rule-built database of hashes, perms, ACLs, SELinux and xattrs
  Intrusion Detection Security Hardening #
• GitHub - SELinuxProject/selinux-notebook: The SELinux Notebook (GitHub) repo
  book-length reference on SELinux policy, kernel components and userspace tools; free, HTML/PDF/EPUB
  Kernel Security Hardening System Administration #
• Home (firewalld) tool
  zone-based dynamic firewall daemon separating runtime from permanent config, with a D-Bus API
  Firewall Network Routing Security Hardening #
• rsyslog 8 daily stable documentation (docs.rsyslog.com) reference
  official docs for the usual Linux syslog daemon: RainerScript routing, filtering, Kafka output
  Logging System Administration #
• Welcome to Ceph — Ceph Documentation (docs.ceph.com) reference
  unified distributed storage: S3/Swift object, thin-provisioned block, POSIX CephFS; dev-branch docs
  Block Storage Network Filesystem Object Storage #
• Rook - Rook Ceph Documentation (rook.io) reference
  Kubernetes operator that deploys and self-manages Ceph block, object and file storage; CNCF graduated project
  Block Storage Kubernetes Operator Object Storage #
• Gluster (Gluster) tool
  Scale-out network filesystem pooling commodity hardware into large volumes; free, news ends 2021
  Filesystem Network Filesystem #
• MinIO AIStor Documentation (MinIO AIStor Documentation) reference
  S3-compatible object store with Iceberg tables and SFTP; installing and operating AIStor clusters
  Commercial Support Kubernetes Object Storage #
• GitHub - seaweedfs/seaweedfs: SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables, designed to handle billions of files with O(1) disk access and effortless horizontal scaling. (GitHub) repo
  Distributed store for billions of small files: S3 endpoint, filer, Iceberg tables; Apache-2.0
  Network Filesystem Object Storage #
• The Garage team - An S3 object store so reliable you can run it outside datacenters (Garage) tool
  single dependency-free binary S3 store, data replicated across 3 zones, made to run between sites; AGPL
  Object Storage Self Hosting #
• Lustre (lustre.org) tool
  parallel scale-out filesystem for HPC clusters; releases roadmap, LNET, benchmarking and admin wiki
  Filesystem HPC Network Filesystem #
• ext4 Data Structures and Algorithms — The Linux Kernel documentation (docs.kernel.org) reference
  on-disk layout of ext4: superblock, block groups, inodes, extents, journalling and checksums
  Filesystem Kernel #
• The SGI XFS Filesystem — The Linux Kernel documentation (docs.kernel.org) reference
  XFS mount options and on-disk behaviour: allocsize, discard, journaling and large-filesystem tuning
  Filesystem Kernel Performance Analysis #
• Welcome to BTRFS documentation! — BTRFS documentation (btrfs.readthedocs.io) reference
  copy-on-write filesystem docs: features, fault tolerance, repair and btrfs-progs man pages
  Backup Filesystem #
• bcachefs (bcachefs.org) tool
  copy-on-write Linux filesystem with checksumming, replication, erasure coding, tiering, snapshots
  Block Storage Filesystem Kernel #
• LVM2 Resource Page (sourceware.org) tool
  userspace logical volume manager over device-mapper: source tarballs, mirrors, mailing lists
  Block Storage Filesystem Kernel #
• Stratis Storage (stratis-storage.github.io) tool
  local storage pool manager layered on device-mapper, XFS, LUKS and Clevis; online re-encryption
  Block Storage Encryption Filesystem #
• cryptsetup / LUKS (GitLab) repo
  Linux disk encryption tooling and the LUKS on-disk format
  Encryption Filesystem #
• Linux Raid Wiki (archive.kernel.org) reference
  archived linux-raid list reference for md/mdadm software RAID, kernel 4 era; superseded, no longer updated
  Block Storage Filesystem Kernel #
• NFS — The Linux Kernel documentation (docs.kernel.org) reference
  Kernel-side NFS client and server administration: nfsroot, NFS/RDMA, admin interfaces, I/O stats
  Kernel Network Filesystem System Administration #
• Samba (GitLab) repo
  SMB/CIFS file and print sharing for Unix, and an AD domain controller
  Directory Service Network Filesystem #
• Open-iSCSI by open-iscsi (open-iscsi.com) tool
  Linux iSCSI initiator per RFC 3720: iscsid daemon and iscsiadm over kernel data-path modules, GPL-2.0
  Block Storage Kernel System Administration #
• NVM Express (NVM Express - scalable, efficient, and industry standard) organisation
  Non-profit consortium publishing NVMe and NVMe-over-Fabrics specs across PCIe, RDMA and TCP
  Block Storage Hardware Nonprofit #
• ClusterLabs (ClusterLabs) tool
  upstream of Pacemaker and Corosync: cluster-wide service recovery, fencing and multi-site failover
  High Availability System Administration #
• Pacemaker documentation (ClusterLabs) reference
  cluster resource manager docs: Clusters from Scratch walkthrough plus exhaustive Pacemaker Explained
  Disaster Recovery High Availability System Administration #
• Corosync by corosync (corosync.github.io) tool
  cluster messaging and quorum engine under Pacemaker: virtual synchrony, membership, process restart
  High Availability System Administration #
• Keepalived (keepalived.org) tool
  VRRP failover plus IPVS layer-4 load balancing, with health checkers and BFD-driven fast takeover
  High Availability Load Balancing Network Routing #
• User Guides and Product Documentation (LINBIT) reference
  guides for DRBD replicated block devices, LINSTOR and clustering; certified binaries are paid
  Block Storage Commercial Support Disaster Recovery High Availability #
• MariaDB Galera Cluster | Galera Cluster | MariaDB Documentation (mariadb.com) reference
  synchronous multi-master replication for MariaDB: implementation, config and production operation
  Database Administration High Availability Relational Database #
• https://access.redhat.com/products/red-hat-high-availability-add-on (access.redhat.com) reference
  RHEL clustering add-on for failover services; needs a paid subscription
  Enterprise Linux High Availability Red Hat #
• Bareos Main Reference and Documentation — Bareos Documentation documentation (docs.bareos.org) reference
  reference for Bareos network backup: director, console and webui config, Python API
  Backup Disaster Recovery System Administration #
• Restic Documentation — restic 0.19.1 documentation (restic.readthedocs.io) reference
  restic manual: repositories on SFTP, S3, B2, Azure, rclone; snapshots, encryption, pruning, scripted backups
  Backup Encryption Object Storage #
• What is Kopia? (kopia.io) reference
  Encrypted, deduplicated, compressed snapshots to cloud, NAS or local repos; CLI and GUI, open source
  Backup Command Line Encryption #
• Relax-and-Recover - Linux Disaster Recovery (relax-and-recover.org) tool
  bare-metal disaster recovery: bootable rescue images plus dozens of backup back-ends, GPL
  Backup Bare Metal Provisioning Disaster Recovery #
• Free Backup for Linux workloads - Veeam Agent for Linux (Veeam Software) tool
  No-cost single-machine Linux backup agent, file and volume level, changed-block tracking
  Backup Disaster Recovery Free Tier #
• Red Hat Enterprise Linux (redhat.com) tool
  vendor overview of RHEL 10 variants, use cases and support posture; paid subscription product
  Commercial Support Enterprise Linux Red Hat #
• Red Hat Universal Base Image - Red Hat Ecosystem Catalog (catalog.redhat.com) reference
  freely redistributable RHEL-derived OCI base images: platform, minimal, micro, plus runtime images
  Container Enterprise Linux Free Tier Red Hat #
• Home - Red Hat Ecosystem Catalog (catalog.redhat.com) reference
  searchable index of certified Red Hat and partner products and container images across RHEL and OpenShift
  Container Enterprise Linux Red Hat #
• Understanding Linux (redhat.com) article
  Vendor explainer on what Linux is: distro choice, Fedora versus RHEL, cloud and high-availability uses
  Distro Enterprise Linux Red Hat #
• Containers explained: What they are and why you should care (redhat.com) article
  vendor explainer on container isolation and portability across dev, cloud and on-premise
  Container Red Hat #
• Learning Ansible basics (redhat.com) article
  how modules, inventories and playbooks work, and what the paid Automation Platform adds on top
  Ansible Configuration Management DevOps #
• Red Hat OpenShift (redhat.com) tool
  editions from managed ROSA and ARO to self-managed Container Platform; commercial, free dev tiers
  Commercial Support Kubernetes OpenShift Red Hat #
• Red Hat Ansible Automation Platform (redhat.com) tool
  Red Hat's subscription platform atop Ansible for Linux, Windows, network and VM automation at scale
  Ansible Commercial Support Configuration Management Red Hat #
• Training and Certification (redhat.com) reference
  Red Hat course and exam catalogue from RH124 up, plus the paid Red Hat Learning Subscription
  Certification Enterprise Linux Red Hat #
• SUSE Linux Enterprise Server Distribution | Linux Server | SUSE (suse.com) organisation
  Vendor overview of SLES 16: long lifecycle, Common Criteria EAL4+, reproducible builds, subscription
  Commercial Support Enterprise Linux SUSE #
• Community (Rancher Labs) organisation
  Rancher and SUSE cloud native community hub: Rancher Academy training, GitHub, Slack, events
  Container Kubernetes SUSE #
• Documentation: Apache HTTP Server - The Apache HTTP Server Project (httpd.apache.org) reference
  Version-indexed httpd manuals (2.4, trunk, legacy), offline zips, plus user recipe wiki
  HTTP Web Server #
• nginx documentation (nginx.org) reference
  request processing, server names, HTTPS setup, HTTP load balancing and full module reference
  Load Balancing Reverse Proxy Web Server #
• NGINX Unit: Universal web app server (unit.nginx.org) tool
  polyglot app server with runtime JSON config, TLS and routing; maintainers ship no new features
  Application Server Reverse Proxy Web Server #
• Home - lighty news (lighttpd.net) tool
  small-footprint web server with FastCGI, CGI, rewriting and TLS 1.3 defaults, revised BSD license
  HTTP Web Server #
• OpenLiteSpeed (openlitespeed.org) tool
  Free open-source LiteSpeed edition: event-driven, mod_rewrite-compatible, WebAdmin GUI, page cache
  Caching Free Tier Web Server #
• H2O - the optimized HTTP server (h2o.examp1e.net) tool
  HTTP/2 and HTTP/3 server with ACME certificates, prioritisation and mruby scripting; open source
  HTTP TLS Web Server #
• Apache Tomcat® - Welcome! (tomcat.apache.org) tool
  Jakarta Servlet, Pages and WebSocket implementation hosting Java web apps, Apache-2 licensed
  Application Server HTTP Web Server #
• The Eclipse Jetty Project :: Eclipse Jetty (jetty.org) tool
  embeddable Java servlet container and HTTP/1-3 plus WebSocket server; EPL2 and Apache-2.0
  Application Server HTTP Web Server #
• WildFly (WildFly) tool
  modular Jakarta EE application server from Red Hat, managed via CLI, REST, JMX and web console
  Application Server Red Hat #
• IIS documentation (learn.microsoft.com) reference
  Microsoft IIS docs hub: configuration, architecture, administration, IIS Express and the Administration API
  Web Server Windows #
• HTTP | Node.js v26.7.0 Documentation (nodejs.org) reference
  node:http client and server API: low-level stream and header handling, no body parsing
  HTTP Web Server #
• Get started with Deno (Deno) reference
  TypeScript-first JavaScript runtime, sandboxed by default, with built-in formatter, linter and tests
  Application Server Command Line Javascript Runtime #
• http.server — HTTP servers (Python documentation) reference
  Python stdlib HTTPServer and request-handler classes; explicitly not for production use
  HTTP Web Server #
• Gunicorn - Python WSGI HTTP Server for UNIX (gunicorn.org) tool
  pre-fork WSGI/ASGI server fronting Django, Flask or FastAPI; one command, minimal dependencies
  Application Server Web Server #
• Index - Uvicorn (uvicorn.dev) reference
  ASGI server for Python async frameworks, HTTP/1.1 and WebSockets, run from CLI or programmatically
  Application Server HTTP Web Server #
• A Fast, Concurrent Web Server for Ruby & Rack - Puma (puma.io) tool
  concurrent HTTP/1.1 server for Ruby Rack apps, Ragel-based parser, far lower memory than Unicorn
  Application Server HTTP Web Server #
• PHP: FastCGI Process Manager (FPM) - Manual (php.net) reference
  PHP FastCGI process manager: per-pool uid/chroot workers, dynamic spawning, slowlog, status output
  Application Server Performance Analysis Web Server #
• FrankenPHP: the modern PHP app server (frankenphp.dev) tool
  PHP app server on Caddy: worker mode keeps apps in memory, one binary, Symfony and Laravel support
  Application Server Web Server #
• HAProxy - The Reliable, High Perf. TCP/HTTP Load Balancer (haproxy.org) tool
  free TCP and HTTP reverse proxy for load balancing very high traffic, several branches maintained
  High Availability HTTP Load Balancing Reverse Proxy #
• Envoy proxy - documentation (envoyproxy.io) reference
  per-version documentation index for the CNCF L7 proxy, stable through archived releases
  Load Balancing Reverse Proxy Service Mesh #
• squid : Optimising Web Delivery (squid-cache.org) tool
  GPL caching forward proxy for HTTP/HTTPS/FTP with access controls and cache hierarchies
  Caching HTTP Reverse Proxy #
• Cloudflare Tunnel (Cloudflare Docs) reference
  cloudflared outbound-only tunnels exposing HTTP, SSH and RDP origins with no public IP; free tier available
  Free Tier Reverse Proxy Self Hosting VPN #
• Documentation (letsencrypt.org) reference
  Free automated ACME certificate authority: client choices, rate limits, chains of trust, staging
  Free Tier PKI TLS #
• Certbot (certbot.eff.org) tool
  EFF's ACME client automating free Let's Encrypt certificates, with per-server install instructions
  Free Tier PKI TLS Web Server #
• GitHub - acmesh-official/acme.sh: A pure Unix shell script ACME client for SSL / TLS certificate automation (GitHub) repo
  POSIX shell ACME client issuing and renewing free TLS certs, wildcard and ECDSA, no root needed
  PKI Shell Scripting TLS #
• Lego :: ACME client and library written in Go. (ACME client and library written in Go.) reference
  ACME certificate issuance and renewal via HTTP-01, TLS-ALPN-01 or DNS-01 across 200+ DNS providers
  DNS PKI TLS #
• Mozilla SSL Configuration Generator (ssl-config.mozilla.org) tool
  generator of TLS cipher and protocol config for common web servers; now redirects to TLSRef Configurator
  Security Hardening TLS Web Server #
• SSL Server Test (Powered by Qualys SSL Labs) (ssllabs.com) tool
  free online deep analysis of any public HTTPS server's TLS configuration, protocols and ciphers
  Network Diagnostic TLS #
• /bin/bash based TLS/SSL tester: testssl.sh (testssl.sh) tool
  Bash script probing a server's TLS/SSL protocols, ciphers and weaknesses; GPLv2, donation-funded
  Command Line Penetration Testing TLS #
• OWASP Modsecurity Project (Modsecurity Project) tool
  cross-platform WAF module with a rules language, paired with OWASP CRS; open source
  Firewall Security Hardening Web Server #
• OpenSSL Documentation (docs.openssl.org) reference
  openssl command line, libssl/libcrypto functions, TLS and QUIC client/server guides, FIPS notes
  Encryption PKI TLS #
• FastCGI Specification (fastcgi-archives.github.io) reference
  1996 Open Market protocol between web servers and long-lived FastCGI application processes
  Application Server HTTP Web Server #
• RFC 9113: HTTP/2 (IETF Datatracker) reference
  standards-track HTTP/2 spec: framing, field compression, multiplexing; obsoletes RFC 7540
  HTTP Web Server #
• RFC 9114: HTTP/3 (IETF Datatracker) reference
  standards-track mapping of HTTP semantics onto QUIC streams, and how HTTP/2 extensions port over
  HTTP QUIC #
• HTTP: Hypertext Transfer Protocol | MDN (MDN Web Docs) reference
  HTTP protocol guides and per-header/method/status reference for the client-server web model
  HTTP Web Server #
• Clonezilla - About (clonezilla.org) reference
  Partition and disk imaging tool for bare-metal backup, recovery, and mass deployment of systems
  Backup Disaster Recovery System Administration #
• Tutorials (digitalocean.com) reference
  DigitalOcean community tutorials, a large free library of Linux server guides
  DevOps System Administration #
• Initial Server Setup with Ubuntu (digitalocean.com) tutorial
  First steps on a fresh Ubuntu server: non-root user, sudo, SSH access, firewall
  Security Hardening System Administration Ubuntu #
• How to Set Up SSH Keys on Ubuntu: A Comprehensive Guide (digitalocean.com) tutorial
  Generating an SSH keypair and installing the public key for passwordless login
  Authentication Security Hardening SSH #
• How To Install LAMP Stack (Apache, MySQL, PHP) on Ubuntu (digitalocean.com) tutorial
  Installing Apache, MySQL and PHP on Ubuntu as a working LAMP stack
  Relational Database Ubuntu Web Server #
• DigitalOcean (digitalocean.com) tutorial
  nginx server blocks: hosting several sites on one machine with virtual hosts
  System Administration Web Server #
• UFW Essentials: Common Firewall Rules and Commands for Linux Security (digitalocean.com) tutorial
  UFW rule syntax and command reference: allow, deny, ports, services, logging
  Firewall Security Hardening #
• How To Protect SSH with Fail2Ban on Ubuntu 22.04 (digitalocean.com) tutorial
  Fail2ban jails that watch auth logs and ban repeated SSH login failures
  Intrusion Detection Security Hardening SSH #
• How To Secure Nginx with Let's Encrypt on Ubuntu (digitalocean.com) tutorial
  Issuing and auto-renewing Let's Encrypt certificates for nginx with Certbot
  PKI TLS Web Server #
• How To Install PostgreSQL on Ubuntu (digitalocean.com) tutorial
  Installing PostgreSQL on Ubuntu and creating roles and databases
  Database Administration Relational Database Ubuntu #
• How to Install Docker on Ubuntu – Step-by-Step Guide (digitalocean.com) tutorial
  Installing Docker Engine on Ubuntu and running your first containers
  Container Container Runtime Ubuntu #
• Understanding Systemd Units and Unit Files (digitalocean.com) tutorial
  What systemd units are and how unit file sections and directives fit together
  Init System Service Management Systemd #
• About this project (The Debian Administrator's Handbook) reference
  Debian sysadmin book by two Debian developers; free online, DFSG-compatible license, paperback sold
  Debian System Administration #
• Debian Reference (debian.org) reference
  post-installation overview of the Debian system, covering admin tasks through shell-command examples
  Command Line Debian System Administration #
• Ubuntu Server documentation (Ubuntu Server) reference
  Canonical's own server guide: installation, netplan, DNS/DHCP, firewalls, DNSSEC, Ubuntu Pro
  Enterprise Linux System Administration Ubuntu #
• Home - Documentation (docs.rockylinux.org) reference
  docs hub for the RHEL-compatible rebuild: install, build and day-to-day admin guides, no cost
  Distro Enterprise Linux System Administration #
• openSUSE Documentation (openSUSE Documentation) reference
  Leap release notes with startup, reference, security, tuning, virtualization and AutoYaST manuals
  Distro SUSE System Administration #
• Category:System administration - ArchWiki (wiki.archlinux.org) reference
  index of ArchWiki sysadmin pages: 23 subcategories spanning maintenance and troubleshooting
  Arch Linux System Administration #
• Handbook:Main Page - Gentoo wiki (wiki.gentoo.org) reference
  install and base-administration manual for a source-based distro: Portage, OpenRC, many CPU arches
  Build From Source Gentoo Package Manager System Administration #
• Alpine User Handbook - Alpine Linux Documentation (docs.alpinelinux.org) reference
  musl and BusyBox distro: install-to-disk steps and system components for desktop and server
  Alpine Linux Distro System Administration #
• FreeBSD Handbook (FreeBSD Documentation Portal) reference
  official manual for installing and administering FreeBSD base systems
  BSD System Administration #
• OpenBSD Frequently Asked Questions (openbsd.org) reference
  supplemental admin guide to the man pages: console and serial setup, pf example rulesets, current release
  BSD Firewall System Administration #
• The NetBSD Guide (netbsd.org) reference
  Official NetBSD handbook: installation and day-to-day administration of the BSD base system
  BSD System Administration #
• LinuxCommand.org: Learn The Linux Command Line. Write Shell Scripts. (linuxcommand.org) tutorial
  William Shotts' free shell tutorials plus the full text of The Linux Command Line book
  Command Line Shell Scripting #
• The GNU Bourne-Again Shell (tiswww.case.edu) tool
  GNU Bash upstream home: POSIX shell implementation, releases, patches and manual, GPLv3
  Command Line Shell Scripting Unix Standard #
• BashPitfalls - Greg's Wiki (mywiki.wooledge.org) reference
  catalogue of common bash mistakes - word splitting, globbing, quoting - each shown with the correct form
  Command Line Shell Scripting #
• tldr pages (tldr.sh) tool
  community-written simplified man pages: practical examples per command, clients for every platform, free
  Command Line Shell Scripting System Administration #
• Shell Command Language (pubs.opengroup.org) reference
  POSIX.1-2024 normative definition of sh: token recognition, word expansion, redirection, compound commands
  Command Line Shell Scripting Unix Standard #
• Unix & Linux Stack Exchange (Unix & Linux Stack Exchange) forum
  Voted question-and-answer board where Unix and Linux users work through admin and shell problems
  Command Line Shell Scripting System Administration #
• Julia Evans (Julia Evans) personal-site
  posts and zines on the terminal, man pages, tcpdump and dig, git internals and SQLite
  Command Line Hacker Culture Network Diagnostic #
• Google SRE - Site reliability engineering book Google index (sre.google) reference
  Google's reliability practice as chapters: SLOs, toil, on-call, incident response; free to read online
  DevOps Observability System Administration #
• Linux Essentials Exam 010 Objectives (Linux Professional Institute (LPI)) reference
  objectives and weightings for LPI Linux Essentials exam 010-160, version 1.6 syllabus
  Certification Command Line Exam Objective System Administration #
• LPIC-1 Exam 101 and 102 Objectives (Linux Professional Institute (LPI)) reference
  LPIC-1 101-500/102-500 objectives v5.0 with per-topic weightings, junior Linux admin level
  Certification Exam Objective System Administration #
• LPIC-2 Exam 201 and 202 Objectives (Linux Professional Institute (LPI)) reference
  LPIC-2 201-450/202-450 objectives with weights: mixed MS/Linux LAN, gateway and internet servers
  Certification Exam Objective System Administration #
• LPIC-3 Exam 300 Objectives (Linux Professional Institute (LPI)) reference
  objectives for LPIC-3 exam 300-300: Samba daemons, SMB/CIFS, Active Directory and LDAP, weighted
  Certification Directory Service Exam Objective Network Filesystem #
• LPIC-3 Exam 303 Objectives (Linux Professional Institute (LPI)) reference
  LPIC-3 303-300 Security exam objectives with weights: X.509 and PKI, crypto, hardening, access control
  Certification Exam Objective PKI Security Hardening #
• LPIC-3 Exam 305 Objectives (Linux Professional Institute (LPI)) reference
  objectives and topic weights for exam 305-300: full virtualization, container tech, cloud orchestration
  Certification Container Exam Objective Virtualization #
• LPIC-3 Exam 306 Objectives (Linux Professional Institute (LPI)) reference
  LPIC-3 306 exam objectives, weighted: HA cluster management, cluster storage, distributed block devices
  Block Storage Certification Exam Objective High Availability #
• Security Essentials Exam 020 Objectives (Linux Professional Institute (LPI)) reference
  objectives and weightings for LPI exam 020-100, an entry-level digital self-defence security certificate
  Certification Exam Objective Security Hardening #
• Web Development Essentials Exam 030 Objectives (Linux Professional Institute (LPI)) reference
  LPI 030-100 objectives: markup, styling, browser scripting, server-side code and SQL persistence
  Certification Exam Objective Web Development #
• Summary of LPI Certifications (Linux Professional Institute (LPI)) reference
  vendor-neutral LPI exam ladder from Essentials to LPIC-3: prerequisites, languages, validity; paid
  Certification System Administration #
• Linux Professional Institute – Learning (learning.lpi.org) reference
  hub for LPI's freely published, open-licensed courseware for teachers preparing candidates for its exams
  Certification Free Tier System Administration #
• Explore Red Hat certifications to complete your learning journey. (redhat.com) organisation
  Red Hat exam pathways by level, from entry technologist to architect; paid, performance-based
  Certification Enterprise Linux Red Hat #
• Red Hat Certified System Administrator exam | EX200 (redhat.com) reference
  EX200 objectives for the performance-based RHCSA, based on RHEL 10; paid proctored exam
  Certification Enterprise Linux Exam Objective Red Hat #
• Red Hat Certified Advanced System Administrator in Ansible Exam | EX294 (redhat.com) reference
  EX294 objectives: writing Ansible playbooks to administer RHEL; counts toward RHCE, paid performance exam
  Ansible Certification Exam Objective Red Hat #
• Red Hat Certified System Administrator in OpenShift exam | EX280 (redhat.com) reference
  EX280 objectives for Red Hat Certified System Administrator in OpenShift 4.18, paid exam
  Certification Exam Objective OpenShift Red Hat #
• Explore Red Hat certifications to complete your learning journey. (redhat.com) organisation
  Red Hat's certification ladder from Technologist to Architect; paid, product-specific exam paths
  Certification Enterprise Linux Red Hat #
• Red Hat Learning Subscription (redhat.com) organisation
  Paid annual Red Hat training subscription: course curriculum, labs and certification exam access
  Certification Commercial Support Interactive Lab Red Hat #
• Linux Foundation Certified System Administrator (LFCS) | Linux Foundation Education (Linux Foundation - Education) reference
  exam domains and weightings: ops deployment, networking, storage; paid vendor-neutral performance exam
  Certification Exam Objective System Administration #
• LFCE Cert Inactive (Linux Foundation - Education) organisation
  Linux Foundation LFCE engineer certification; the page lists the exam as inactive
  Certification Exam Objective #
• Certified Kubernetes Administrator (CKA) | Linux Foundation Education (Linux Foundation - Education) reference
  CKA scope and pricing: cluster ops, workloads, storage, troubleshooting; $445 exam-only, bundles above
  Certification Exam Objective Kubernetes #
• Certified Kubernetes Application Developer (CKAD) | Linux Foundation Education (Linux Foundation - Education) reference
  CKAD exam domains for Kubernetes app developers; $445 exam alone, $625-$645 bundled with training
  Certification Exam Objective Kubernetes #
• 認定Kubernetesセキュリティスペシャリスト (CKS-JP) (Linux Foundation - Education) reference
  CKS exam objectives and domain weights: cluster hardening, supply chain, runtime; paid hands-on
  Certification Exam Objective Kubernetes Security Hardening #
• Kubernetes and Cloud Native Associate (KCNA) | Linux Foundation Education (Linux Foundation - Education) reference
  KCNA vendor-neutral cloud native exam: domains, prep handbook, two attempts; $250 exam-only
  Certification Exam Objective Kubernetes #
• Homepage (Linux Foundation - Education) organisation
  Linux Foundation vendor-neutral courses and exams: Linux, Kubernetes, security; some free, most paid
  Certification DevOps Nonprofit #
• Introduction to Linux (LFS101) | Linux Foundation Education (Linux Foundation - Education) tutorial
  no-cost self-paced beginner course: CLI basics, graphical config, major distro families
  Command Line Free Tier System Administration #
• GitHub - cncf/curriculum: 📚Open Source Curriculum for CNCF Certification Courses (GitHub) repo
  CNCF exam curricula for CKA, CKAD, CKS, KCNA and more, versioned to Kubernetes releases; CC-BY 4.0, free
  Certification Exam Objective Kubernetes #
• Linux+ Certification V8 | CompTIA (comptia.org) reference
  CompTIA Linux+ V8 objectives and exam details: hardening, automation, containers, paid exam
  Certification Exam Objective System Administration #
• Server+ (Plus) Certification | CompTIA (comptia.org) reference
  CompTIA Server+ V5 objectives: server hardware, administration, security, disaster recovery; paid exam
  Certification Exam Objective System Administration #
• SUSE Certification Exams | SUSE (suse.com) organisation
  SUSE and SLES certification exam catalogue, remotely proctored via Questionmark, paid per exam
  Certification Enterprise Linux SUSE #
• AWS Certification Home (Amazon Web Services, Inc.) reference
  index of AWS credential tiers by job role, foundational through specialty, with per-role exam guides; paid
  Certification Public Cloud #
• Professional and Technical Credentials and Certifications (learn.microsoft.com) reference
  index of Microsoft role-based certifications and Applied Skills lab assessments, free Learn training paths
  Certification Public Cloud Windows #
• Certifications | Google Cloud (Google Cloud) reference
  index of Google Cloud exams from foundational to professional, each with its own exam guide; paid
  Certification Exam Objective Public Cloud #
• Linux Unhatched (netacad.com) tutorial
  Cisco NetAcad's free 8-hour introduction to Linux, no prerequisites
  Certification Interactive Lab #
• DevOps Roadmap: Learn to become a DevOps Engineer or SRE (roadmap.sh) reference
  Interactive skill tree for the DevOps/SRE career path: practices, delivery culture, free to use
  Continuous Integration DevOps System Administration #
• Linux Roadmap (roadmap.sh) reference
  community-built learning path ordering Linux skills as a step-by-step skill tree, free to use
  DevOps System Administration #
• OverTheWire: Bandit (overthewire.org) tutorial
  beginner shell levels played over SSH, each password hidden on the box; free to play
  Command Line Interactive Lab Shell Scripting SSH #
• Killercoda (killercoda.com) tool
  Browser-based Linux and Kubernetes lab scenarios, free tier plus paid
  Certification Interactive Lab Kubernetes #
• PostgreSQL: Documentation (postgresql.org) reference
  version-indexed PostgreSQL manuals, current and unsupported releases, browsable or PDF
  Database Administration Relational Database SQL #
• GitHub - mysql/mysql-server: MySQL Server, the world's most popular open source database, and MySQL Cluster, a real-time, open source transactional database. (GitHub) repo
  Oracle's MySQL server and NDB Cluster sources, GPLv2 community edition
  Database Administration Relational Database SQL #
• MariaDB Foundation - MariaDB.org (MariaDB.org) organisation
  MariaDB Foundation news on server internals: pluggable aggregates, JSON_TABLE, sponsorship; MariaDB is GPLv2
  Nonprofit Relational Database SQL #
• SQLite Home Page (sqlite.org) tool
  Self-contained C library SQL engine with no server process, public-domain source
  Relational Database SQL #
• Firebird: The true open source database for Windows, Linux, Mac OS X and more (Home) tool
  InterBase-lineage SQL engine for Linux, Windows and macOS; open source, commercial support ecosystem
  Database Administration Relational Database SQL #
• MySQL Software (Percona) tool
  Percona's MySQL stack: drop-in server, XtraDB Cluster, XtraBackup, operator; no licensing fees
  Backup Database Administration High Availability Relational Database #
• MonetDB (MonetDB) tool
  column-store SQL engine for analytics and hybrid HTAP, full ACID, window functions, UDF hooks; open source
  Analytical Database Relational Database SQL #
• Apache Derby (db.apache.org) tool
  embedded Java relational database with JDBC drivers, ~3.5 MB footprint; retired read-only since Oct 2025
  Database Administration Relational Database SQL #
• H2 Database Engine (redirect) (h2database.com) tool
  Embedded Java SQL engine, open source, runs in-process or as a standalone server
  Relational Database SQL #
• CUBRID | Enterprise Open Source DBMS (cubrid.org) tool
  OLTP-tuned open source DBMS with heartbeat-based HA failover, broker middleware and GUI admin
  Database Administration High Availability Relational Database #
• SQL Server Downloads | Microsoft (microsoft.com) tool
  installer downloads per SQL Server edition; Express and Developer free, trials for the rest
  Database Administration Free Tier Relational Database #
• What is SQL Server on Linux? - SQL Server (learn.microsoft.com) reference
  running Microsoft's proprietary engine on RHEL, Ubuntu, SLES, in containers or WSL2
  Database Administration Relational Database SQL #
• Oracle AI Database Free | Oracle (oracle.com) tool
  no-cost Oracle 26ai edition capped at 2 CPUs, 2 GB RAM and 12 GB data; formerly Express Edition
  Database Administration Free Tier Relational Database #
• Db2 | IBM (ibm.com) tool
  IBM enterprise database for mixed transactional and analytic workloads; free Community Edition
  Commercial Support Free Tier Relational Database #
• CockroachDB Docs - CockroachDB (CockroachDB) reference
  distributed SQL built to survive region failures; docs plus free Cockroach University, core source-available
  Distributed SQL Relational Database SQL #
• YB Documentation (YugabyteDB Docs) reference
  Distributed PostgreSQL-compatible SQL: geo-distribution, sharding, Kubernetes deploys, Apache-2.0
  Distributed SQL High Availability Relational Database #
• TiDB Self-Managed (docs.pingcap.com) reference
  MySQL-compatible HTAP cluster: TiUP and Kubernetes deployment, TiFlash, migration, tuning; Apache-2.0
  Analytical Database Distributed SQL Relational Database #
• Vitess (vitess.io) tool
  Sharding, connection pooling and automatic failover layer fronting MySQL; live resharding
  Distributed SQL High Availability Relational Database #
• Citus Data | Distributed Postgres. At any scale. (Citus Data) tool
  Postgres extension adding row- and schema-based sharding for scale-out; open source, free to self-manage
  Distributed SQL Relational Database SQL #
• Home - ClickHouse Documentation (ClickHouse Documentation) reference
  column-store OLAP engine for analytics and warehousing, Apache-2.0; docs index and integration catalogue
  Analytical Database Database Administration SQL #
• An in-process SQL OLAP database management system (DuckDB) tool
  in-process OLAP engine querying CSV and Parquet in place and pandas frames directly, MIT licensed
  Analytical Database SQL #
• Tiger Data Documentation (Tiger Data Docs) reference
  TimescaleDB, the PostgreSQL time-series extension: hypertables, continuous aggregates, self-run or cloud
  Relational Database SQL Time Series Database #
• Low-latency time-series database on open formats | QuestDB (QuestDB) tool
  SQL-queried time-series store aimed at high-rate ingest; Apache-2.0 core, commercial editions
  Analytical Database SQL Time Series Database #
• Apache Doris: Open Source, Real-Time Analytics and Search Database for the AI Era - Apache Doris (doris.apache.org) tool
  MPP column store for sub-second SQL over logs, metrics, JSON and vectors; Apache-licensed
  Analytical Database Object Storage SQL #
• Docs (Docs) reference
  cache, JSON, streams and vector-search guides; source-available core, paid Software and Cloud tiers
  Caching Database Administration Key Value Store #
• Valkey (valkey.io) tool
  BSD-licensed Redis fork under the Linux Foundation: caching, queues or primary key/value store
  Caching High Availability Key Value Store #
• memcached - a distributed memory object caching system (memcached.org) tool
  in-memory key-value cache for database, API and render results to offload web backends; free and open source
  Caching Key Value Store Web Application #
• What is MongoDB? - Database Manual - MongoDB Docs (mongodb.com) reference
  JSON-style document store: flexible schema, sharding, replica-set failover; server under SSPL
  Database Administration Document Database High Availability #
• Apache CouchDB (couchdb.apache.org) tool
  JSON document store with an HTTP API and a replication protocol reaching mobile and browsers
  Document Database HTTP Self Hosting #
• Apache Cassandra | Apache Cassandra Documentation (Apache Cassandra) tool
  Masterless wide-column NoSQL store: linear scaling, multi-datacenter replication, Apache-2.0
  Database Administration High Availability Key Value Store Wide Column Store #
• ScyllaDB For Real-Time AI (ScyllaDB) tool
  Cassandra- and DynamoDB-compatible wide-column store in C++ for low-latency, high-throughput workloads
  Key Value Store Wide Column Store #
• Neo4j documentation - Neo4j Documentation (Neo4j Graph Data Platform) reference
  graph database docs: deployment on Docker/Kubernetes, visual tooling, client libraries; free Community Edition
  Database Administration Free Tier Graph Database #
• Arango Contextual Data Platform (Arango) tool
  graph-native multi-model store (document, key-value, search) pitched as an AI context layer, commercial
  Document Database Graph Database Key Value Store #
• InfluxData Documentation (docs.influxdata.com) reference
  InfluxDB 3 Core/Enterprise/Cloud and the Telegraf collector: open source engine, paid managed tiers
  Observability Public Cloud Time Series Database #
• etcd (etcd) tool
  Raft-replicated strongly consistent key-value store with watches and key TTLs; backs Kubernetes
  High Availability Key Value Store Kubernetes #
• pgAdmin - PostgreSQL Tools (pgadmin.org) tool
  PostgreSQL object browser and query tool with graphical EXPLAIN; desktop or web, open source
  Database Administration Relational Database Web Application #
• DBeaver Community | Free Open-Source Database Management Tool (dbeaver.io) tool
  cross-engine desktop SQL client; Community Edition no-cost under Apache-2.0, paid PRO alongside
  Database Administration Relational Database SQL #
• phpMyAdmin (phpMyAdmin) tool
  web front end for MySQL/MariaDB: tables, users, privileges, SQL, import/export, 97 languages
  Database Administration Relational Database Web Application #
• PgBouncer - lightweight connection pooler for PostgreSQL (pgbouncer.org) tool
  PostgreSQL connection pooler; release notes cover CVE-2025-12819 auth-time SQL injection via search_path
  Database Administration Relational Database Vulnerability #
• Patroni: A Template for PostgreSQL HA with ZooKeeper, etcd or Consul — Patroni 4.1.5 documentation (patroni.readthedocs.io) reference
  PostgreSQL automatic failover and leader election via etcd, ZooKeeper or Consul, open source
  Database Administration High Availability Relational Database #
• SQL Indexing and Tuning e-Book for developers: Use The Index, Luke covers Oracle, MySQL, PostgreSQL, SQL Server, ... (use-the-index-luke.com) tutorial
  vendor-agnostic SQL indexing and query tuning; free web edition of SQL Performance Explained
  Performance Analysis Relational Database SQL #
• Part I. Tutorial (PostgreSQL Documentation) tutorial
  Introductory walkthrough of relational concepts and SQL against PostgreSQL, official Part I
  Relational Database SQL #
• SQLite In 5 Minutes Or Less (sqlite.org) tutorial
  first steps with the sqlite3 command-line shell and the TCL binding; prebuilt binaries or build yourself
  Command Line Relational Database SQL #
• Modern SQL: A lot has changed since SQL-92 (modern-sql.com) reference
  what the SQL standard added after SQL-92 -- CTEs, arrays, temporal -- with per-engine support tables
  Relational Database SQL #
• RabbitMQ: One broker to queue them all | RabbitMQ (rabbitmq.com) tool
  AMQP 1.0 and MQTT 5.0 broker for queues and streams; MPL-2.0 at no cost, paid Broadcom Tanzu support
  Commercial Support Message Broker MQTT #
• Documentation Redirect (kafka.apache.org) reference
  Kafka docs tree: key concepts, APIs, configuration, design, operations, security, Connect and Streams
  Event Streaming Message Broker #
• Apache Pulsar (pulsar.apache.org) tool
  multi-tenant pub-sub plus streaming with geo-replication and tiered storage, top-level ASF project
  Event Streaming Message Broker #
• NATS.io (NATS.io) tool
  single-binary pub/sub, request-reply and JetStream persistence from cloud to edge, open source
  Event Streaming Message Broker #
• ZeroMQ (zeromq.org) tool
  brokerless sockets carrying atomic messages over TCP, IPC and multicast; pub-sub, push-pull, LGPL
  Event Streaming Message Broker #
• Eclipse Mosquitto (Eclipse Mosquitto) tool
  lightweight EPL/EDL MQTT 5.0 broker for IoT, plus C client library and pub/sub CLI clients
  Message Broker MQTT #
• MQTT - The Standard for IoT Messaging (mqtt.org) reference
  pub/sub IoT messaging protocol: three QoS levels, persistent sessions, small headers, TLS and OAuth auth
  Message Broker MQTT #
• Varnish Cache (Varnish Cache) tool
  In-memory HTTP accelerator with VCL policy language and in-process TLS, open source
  Caching HTTP Reverse Proxy #
• Jenkins (Jenkins) tool
  Java automation server for CI/CD pipelines, plugin-extensible, distributing builds across agents
  Continuous Integration DevOps #
• Get started with GitLab CI/CD | GitLab Docs (GitLab Docs) reference
  .gitlab-ci.yml pipelines, stages and jobs; usable on the Free tier as well as Premium/Ultimate
  Continuous Integration DevOps Version Control #
• GitHub Actions documentation - GitHub Docs (GitHub Docs) reference
  workflow authoring, GitHub-hosted and self-hosted runners, custom actions, metrics and scaling limits
  Continuous Integration Version Control #
• Woodpecker CI (woodpecker-ci.org) tool
  container-based CI engine with dependent multi-workflow pipelines and plugins, free under Apache-2.0
  Container Continuous Integration Self Hosting #
• Argo Workflows - The workflow engine for Kubernetes (argo-workflows.readthedocs.io) reference
  container-native workflow and DAG engine built as Kubernetes CRDs, CNCF graduated, open source
  Continuous Integration Kubernetes Kubernetes Operator #
• Salt User Guide — Salt user guide (docs.saltproject.io) reference
  Salt core concepts for remote execution and declarative state, community-written companion to the docs
  Configuration Management DevOps System Administration #
• Introduction (syslog-ng documentation) reference
  admin and developer guides for the open-source edition: install, configure and tune log collection
  Logging System Administration #
• journalctl(1) - Linux manual page (man7.org) reference
  querying and filtering the systemd journal: field matches, boot ranges, output formats
  Command Line Init System Logging #
• Fluentd | Open Source Data Collector (fluentd.org) tool
  CNCF unified logging layer decoupling log sources from backend stores; Apache-2.0
  Logging Observability #
• Vector (vector.dev) tool
  Rust pipeline collecting, transforming and routing logs and metrics via sources/transforms/sinks
  Logging Observability #
• Grafana Loki OSS | Log aggregation system (Grafana Labs) tool
  label-indexed log aggregation inspired by Prometheus, cheap to store; AGPLv3 with hosted Grafana Cloud option
  Logging Observability #
• Alertmanager | Prometheus (prometheus.io) reference
  Deduplicates, groups, silences and routes Prometheus alerts to email, PagerDuty and OpsGenie
  Observability System Administration #
• VictoriaMetrics: Simple, Reliable & Efficient Observability (VictoriaMetrics) tool
  Prometheus-compatible metrics store and monitoring stack; open source core, paid enterprise tier
  Commercial Support Observability Time Series Database #
• OpenTelemetry (OpenTelemetry) tool
  Vendor-neutral APIs, SDKs and collector for traces, metrics and logs; swap backends freely
  Distributed Tracing Logging Observability #
• Jaeger: open source, distributed tracing platform (Jaeger) tool
  CNCF platform mapping request flow across microservices to find bottlenecks; ClickHouse storage backend
  Distributed Tracing Observability Performance Analysis #
• GitHub - akopytov/sysbench: Scriptable database and system performance benchmark (GitHub) repo
  scriptable LuaJIT benchmark: OLTP database workloads plus CPU, memory, fileio and thread tests
  Database Administration Load Testing Performance Analysis #
• Welcome to FIO’s documentation! — fio 3.42-115-gcd29 documentation (fio.readthedocs.io) reference
  job-file reference for the flexible I/O tester: engines, block sizes, latency, terse and JSON output
  Block Storage Load Testing Performance Analysis #
• GitHub - wg/wrk: Modern HTTP benchmarking tool (GitHub) repo
  Multithreaded HTTP load generator on epoll/kqueue, with optional LuaJIT request and report scripting
  HTTP Load Testing Performance Analysis #
• Grafana k6 | Grafana k6 documentation (Grafana Labs) reference
  scripting load, spike, stress and soak tests in JavaScript; open source, paid Grafana Cloud backend
  Load Testing Performance Analysis #
• iPerf - The TCP, UDP and SCTP network bandwidth measurement tool (iperf.fr) tool
  TCP, UDP and SCTP throughput, loss and jitter measurement between two hosts, BSD-licensed
  Load Testing Network Diagnostic Performance Analysis #
• GitHub - ColinIanKing/stress-ng: This is the stress-ng upstream project git repository. stress-ng will stress test a computer system in various selectable ways. It was designed to exercise various physical subsystems of a computer as well as the various operating system kernel interfaces. (GitHub) repo
  380+ stress tests loading CPU, memory, filesystem and cache to trip thermal and kernel faults
  Hardware Load Testing Performance Analysis #
• Kea DHCP (isc.org) tool
  ISC's multi-threaded DHCPv4/v6 server with REST API and Stork dashboard, MPL-2.0
  DHCP System Administration #
• Kea Administrator Reference Manual — Kea 3.2.0 documentation (kea.readthedocs.io) reference
  ISC's DHCPv4/DHCPv6 server administration reference for 3.2.0: configuration and hook libraries, open source
  DHCP System Administration #
• ISC DHCP (isc.org) tool
  End-of-life DHCP server, relay and client; no releases since 2022, paid support for subscribers only
  Commercial Support DHCP #
• Dnsmasq - network services for small networks. (thekelleys.org.uk) reference
  lightweight DNS forwarder plus DHCP, router advertisement and network boot for routers and firewalls
  DHCP DNS Network Routing #
• systemd.network(5) - Linux manual page (man7.org) reference
  systemd-networkd .network unit settings: interface matching, addressing, DHCP client and server
  DHCP Init System Network Routing #
• BIND 9 Administrator Reference Manual — BIND 9 9.20.26 documentation (bind9.readthedocs.io) reference
  authoritative and resolver setup, zone files, DNSSEC signing and validation, plus dig and named manpages
  DNS DNSSEC Network Diagnostic #
• Unbound - About (NLnet Labs) tool
  validating recursive caching resolver with DNS-over-TLS/HTTPS and QNAME minimisation, BSD licence
  DNS DNSSEC Privacy #
• NSD - About (NLnet Labs) tool
  authoritative-only name server built for TLD and root-scale query rates, BSD licensed, paid SLA option
  Commercial Support DNS #
• Knot DNS (knot-dns.cz) tool
  Authoritative-only DNS server with IXFR, DDNS, rate limiting and automatic DNSSEC signing, GPL 3+
  DNS DNSSEC #
• Knot Resolver (knot-resolver.cz) tool
  caching validating resolver from CZ.NIC with modular features and DoH; GPL, free to download
  Caching DNS DNSSEC #
• PowerDNS Authoritative Nameserver - PowerDNS Authoritative Server documentation (doc.powerdns.com) reference
  authoritative nameserver serving zones from MySQL/PostgreSQL, BIND files or JSON APIs via backends
  DNS Relational Database #
• dnsdist Overview - dnsdist documentation (dnsdist.org) reference
  DoS- and abuse-aware DNS load balancer, runtime console, Lua or YAML config, Prometheus metrics
  DNS Load Balancing Security Hardening #
• CoreDNS: DNS and Service Discovery (coredns.io) tool
  Go DNS server chaining plugins for zone files, Kubernetes and cloud service discovery, Apache-2.0
  DNS Kubernetes #
• Root Server Technical Operations Association (root-servers.org) organisation
  live inventory of the 366 root name server sites: operator, global vs local, IPv6 and instance counts
  DNS Root Server #
• https://www.rfc-editor.org/rfc/rfc1035.html (rfc-editor.org) reference
  1987 DNS specification: message format, resource records, resolver and name-server behaviour
  DNS Internet Standard #
• https://www.rfc-editor.org/rfc/rfc8484.html (rfc-editor.org) reference
  IETF Standards Track spec mapping each DNS query-response pair onto an HTTPS exchange
  DNS HTTP Privacy #
• DNSViz | A DNS visualization tool (dnsviz.net) tool
  Web visualiser for a zone's DNSSEC authentication chain and resolution path, flagging errors
  DNS DNSSEC Network Diagnostic #
• OpenLDAP, Documentation (openldap.org) reference
  catalogue of OpenLDAP admin and developer manuals, papers and conference proceedings; OpenLDAP license
  Authentication Directory Service #
• FreeIPA - Identity, Policy, Audit — FreeIPA documentation (freeipa.org) tool
  integrated identity management stack: 389 DS LDAP, MIT Kerberos, DNS, Dogtag CA, Active Directory trusts
  Authentication Directory Service Kerberos PKI #
• Samba - ArchWiki (wiki.archlinux.org) reference
  smb.conf setup for SMB/CIFS file and print sharing, server and client sides, plus domain membership
  Arch Linux Directory Service Network Filesystem #
• Active Directory integration - ArchWiki (wiki.archlinux.org) tutorial
  Joining an Arch host to a Windows domain via Samba: NetBIOS name, Kerberos realm and domain join rights
  Arch Linux Directory Service Kerberos Windows #
• SSSD - System Security Services Daemon - sssd.io (sssd.io) tool
  client daemon enrolling Linux hosts into Active Directory, FreeIPA or LDAP domains for remote identity
  Authentication Directory Service Kerberos #
• Kerberos: The Network Authentication Protocol (web.mit.edu) tool
  MIT's free implementation of Kerberos 5 secret-key network authentication, with krb5 source releases
  Authentication Encryption Kerberos #
• Documentation (Keycloak) reference
  server install, administration, app securing and fine-grained authorization for OIDC and SAML logins
  Authentication Directory Service #
• FreeRADIUS (freeradius.org) tool
  GPL RADIUS server behind ISP and eduroam AAA; 24/7 commercial support from InkBridge
  Authentication Commercial Support #
• Postfix - ArchWiki (wiki.archlinux.org) tutorial
  setting up Postfix on Arch: main.cf and master.cf, aliases, local vs virtual user delivery
  Arch Linux Email Mail Server #
• Home | Dovecot CE (doc.dovecot.org) reference
  IMAP, POP3, LMTP and ManageSieve server docs for the open-source Community Edition; Pro is commercial
  Commercial Support Email Mail Server #
• OpenSMTPD (opensmtpd.org) tool
  OpenBSD's server-side SMTP implementation of RFC 5321, small and auditable, ISC licensed
  BSD Email Mail Server #
• Rspamd — Email Security System (rspamd.com) tool
  Async C spam and phishing filter: regex rules, RBLs, greylisting, SPF/DKIM/DMARC/ARC, ML scoring
  Email Mail Server Spam Filtering #
• OpenDKIM (opendkim.org) tool
  C library plus milter giving sendmail-compatible MTAs DKIM signing and verification, also VBR and ATPS
  Email Mail Server Spam Filtering #
• dmarc.org – Domain Message Authentication Reporting & Conformance (dmarc.org) reference
  DMARC email authentication and reporting over SPF/DKIM; policy, alignment, RFC 9989-9991 standards track
  DNS Email Spam Filtering #
• chrony – Introduction (chrony-project.org) tool
  NTPv4 client, server and peer for hosts with intermittent links or uptime; chronyd plus chronyc
  System Administration Time Synchronization #
• Welcome to NTPsec (ntpsec.org) tool
  Security-hardened fork of NTP Classic, audited and stripped down for high-assurance deployments
  Security Hardening Time Synchronization #
• pool.ntp.org: the internet cluster of ntp servers (ntppool.org) organisation
  volunteer cluster of ~6,100 public time servers, the default NTP source for most distros; free
  System Administration Time Synchronization #
• Welcome to The Linux PTP Project (Linux PTP Project) tool
  IEEE 1588 PTP daemons for Linux built on modern kernel APIs; backed by Network Time Foundation
  Kernel Time Synchronization #
• step-ca Certificate Authority Overview | Smallstep (smallstep.com) reference
  self-run X.509 and SSH certificate authority with ACME and OIDC provisioners; hosted option exists
  PKI SSH TLS #
• EJBCA - The Open-Source Certificate Authority (CA) (EJBCA) tool
  open-source certificate authority for internal PKI, IoT and eIDs, with SignServer signing engine
  Encryption PKI TLS #
• openssl-ca - OpenSSL Documentation (docs.openssl.org) reference
  openssl ca man page: signing requests, self-signing, CRL generation and revocation, serial and policy options
  Command Line PKI TLS #
• Home - Easy RSA (easy-rsa.readthedocs.io) reference
  POSIX-shell X.509 PKI manager over openssl: multiple CAs, certs for OpenVPN and TLS peers
  PKI Shell Scripting TLS VPN #
• strongSwan - IPsec VPN for Linux, Android, FreeBSD, macOS, Windows (strongswan.org) tool
  IPsec IKEv2 daemon with MOBIKE, NAT traversal and a plugin system; GPL, Linux through Windows
  Encryption Network Routing VPN #
• Community Documentation (openvpn.net) reference
  Community Edition docs: setup, routing, ethernet bridging, hardening, key management, platform notes
  Network Routing Security Hardening VPN #
• Docs · Tailscale Docs (Tailscale) reference
  WireGuard mesh overlay: access control, subnet routers, exit nodes, logging; no-cost personal tier
  Free Tier Network Routing VPN #
• Headscale (headscale.net) reference
  self-hosted control server for a single Tailscale tailnet, aimed at hobbyists and small orgs; open source
  Homelab Self Hosting VPN #
• Kubernetes at Scale on any Infrastructure | OKD Kubernetes Platform (okd.io) tool
  opinionated Kubernetes distribution preloading 100+ operators, community upstream of OpenShift
  Kubernetes Kubernetes Operator OpenShift #
• Welcome | Overview | OKD 4 (OpenShift) reference
  Entry point to OKD 4 docs: cluster features, layered offerings and operator life cycles
  Container Kubernetes OpenShift #
• GitHub - crc-org/crc: CRC is a tool to help you run containers. It manages local VMs to run a OpenShift 4.x cluster, Microshift or Podman optimized for testing and development purposes (GitHub) repo
  upstream of OpenShift Local: local VM running single-node OpenShift, MicroShift or Podman
  Kubernetes OpenShift Virtualization #
• MicroShift (MicroShift) tool
  OpenShift trimmed for the device edge: frugal resources, poor networking, safe rollbacks on RHEL for Edge
  Enterprise Linux Kubernetes OpenShift #
• Welcome to Operator framework (operatorframework.io) tool
  Operator SDK, OLM lifecycle manager and OperatorHub for encoding day-1 and day-2 ops into clusters
  Kubernetes Kubernetes Operator #
• OperatorHub.io | The registry for Kubernetes Operators (Operator Hub) reference
  Community registry of Kubernetes Operators, browsable by capability level
  Kubernetes Kubernetes Operator #
• Kubernetes Documentation (Kubernetes) reference
  entry point to Kubernetes concepts, tasks, tutorials and API reference; current plus four prior versions
  Container Kubernetes #
• Kubernetes API (Kubernetes) reference
  Generated reference for every Kubernetes API group, resource type and field the control plane serves
  Container Kubernetes #
• Command line tool (kubectl) (Kubernetes) reference
  kubectl syntax, command operations and kubeconfig handling, with cheat sheet and per-command links
  Command Line Container Kubernetes #
• Kubeadm (Kubernetes) reference
  init/join fast paths for standing up a conformant cluster, plus upgrades; addons out of scope
  Container Kubernetes #
• GitHub - kelseyhightower/kubernetes-the-hard-way: Bootstrap Kubernetes the hard way. No scripts. (GitHub) repo
  manual bootstrap of a control plane and two workers across four machines, no scripts, built for learning
  Interactive Lab Kubernetes #
• CNCF Landscape (CNCF Landscape) reference
  Interactive map of cloud-native projects and vendors by category
  Container DevOps Kubernetes #
• Documentation versions (etcd) reference
  distributed key-value store holding Kubernetes cluster state; versioned documentation index
  High Availability Key Value Store Kubernetes #
• cri-o (cri-o.io) tool
  OCI runtime implementing the Kubernetes CRI, with per-Kubernetes-version rpm and deb repositories
  Container Container Runtime Kubernetes #
• containerd (containerd.io) tool
  CNCF-graduated OCI container runtime: image push/pull, CAS storage, namespaces and lifecycle
  Container Container Runtime Kubernetes #
• GitHub - opencontainers/runc: CLI tool for spawning and running containers according to the OCI specification (GitHub) repo
  reference OCI runtime that spawns Linux containers; seccomp and libpathrs build options
  Container Container Runtime #
• K3s - Lightweight Kubernetes | K3s (docs.k3s.io) reference
  certified Kubernetes in a sub-100MB binary with sqlite3 datastore, for edge, IoT and air-gapped use
  Container Homelab Kubernetes #
• Introduction | RKE2 (docs.rke2.io) reference
  Rancher Kubernetes built for CIS benchmark and FIPS 140-2 pass; containerd, static-pod control plane
  Kubernetes Security Compliance SUSE #
• Overview :: SUSE® Rancher Manager (ranchermanager.docs.rancher.com) reference
  multi-cluster Kubernetes management: RKE or EKS/GKE/AKS clusters, central auth, policy, monitoring
  Container Kubernetes SUSE #
• Sidero Labs | Makers of Talos Linux and Omni (Sidero Labs) tool
  immutable Kubernetes OS with no sshd, shell or package manager: read-only root, gRPC/mTLS API, ~50 binaries
  Bare Metal Provisioning Distro Kubernetes Security Hardening #
• kind (kind.sigs.k8s.io) tool
  Throwaway Kubernetes clusters as Docker, podman or nerdctl container nodes, for local dev and CI
  Container Continuous Integration Kubernetes #
• Welcome! (minikube) reference
  local single-node Kubernetes on Linux, macOS or Windows for learning; VM, container or bare-metal
  Container Interactive Lab Kubernetes #
• Docs Home | Helm (helm.sh) reference
  Kubernetes charts and templating: how-tos, chart template guide, plugins, Helm 4 changes
  Kubernetes Package Manager #
• Kustomize - Kubernetes native configuration management (kustomize.io) tool
  template-free overlay editing of Kubernetes manifests, standalone binary or built into kubectl
  Configuration Management Kubernetes #
• Argo CD - Declarative GitOps CD for Kubernetes (argo-cd.readthedocs.io) reference
  GitOps continuous delivery for Kubernetes, syncing kustomize, Helm or plain manifests from git
  Continuous Integration GitOps Kubernetes #
• Flux Documentation (fluxcd.io) reference
  Kubernetes custom resources that sync cluster state from git sources, multi-tenant and RBAC-aware
  Continuous Integration GitOps Kubernetes #
• Welcome to Tekton (Tekton) reference
  Kubernetes-native CI/CD building blocks: pipelines, triggers, CLI, catalog, signing, results store
  Continuous Integration GitOps Kubernetes #
• Overview - Knative (knative.dev) reference
  scale-to-zero serving and event routing layered over Kubernetes, with the concepts behind it
  Event Streaming Kubernetes Serverless #
• Documentation (Istio) reference
  sidecar and ambient mesh setup, traffic-management tasks, mTLS concepts and CLI/API reference
  Kubernetes Service Mesh TLS #
• Welcome to Cilium’s documentation! — Cilium 1.20.1 documentation (docs.cilium.io) reference
  eBPF and XDP networking, network policy and Hubble observability for Kubernetes workloads
  eBPF Kubernetes Network Routing Observability #
• cert-manager (cert-manager) reference
  issuing and auto-renewing Kubernetes/OpenShift TLS certs from Let's Encrypt, Vault or private CA
  Kubernetes PKI TLS #
• Longhorn | The Longhorn Documentation (Longhorn) reference
  distributed block storage for Kubernetes: per-volume controllers, synchronous replicas across nodes; CNCF/LF
  Block Storage Kubernetes #
• Introduction (Kyverno) reference
  Kubernetes-native policy engine governing declarative configuration and runtime behaviour
  Kubernetes Kubernetes Operator Security Compliance #
• PuTTY: a free SSH and Telnet client (chiark.greenend.org.uk) tool
  Simon Tatham's MIT-licensed SSH, Telnet and serial client with xterm emulator, Windows and Unix
  SSH Terminal Emulator Windows #
• Front Page — Free Software Foundation — working together for free software (fsf.org) organisation
  Nonprofit behind the GPL, running Defective by Design, End Software Patents and email self-defense
  Advocacy Copyleft Licensing Nonprofit #
• Software Freedom Conservancy (sfconservancy.org) organisation
  Nonprofit fiscal host for FOSS projects; copyleft enforcement, right-to-repair and policy advocacy
  Advocacy Copyleft Nonprofit #
• Linux Foundation - Decentralized innovation, built with trust (linuxfoundation.org) organisation
  Neutral host for the kernel and 1300+ other projects, plus open hardware and standards work
  Governance Nonprofit Project Funding #
• Software Freedom Law Center (softwarefreedom.org) news
  legal counsel for FOSS projects and foundations: licensing, nonprofit structure and code-of-conduct practice
  Governance Licensing Nonprofit #
• Electronic Frontier Foundation (Electronic Frontier Foundation) organisation
  US nonprofit litigating and campaigning on privacy, free expression and technology law
  Advocacy Nonprofit Privacy #
• Welcome to The Apache Software Foundation | Apache Software Foundation (apache.org) organisation
  501(c)(3) giving projects a neutral home: legal umbrella, infrastructure and community-over-code rules
  Governance Nonprofit Project Funding #
• About Us | Global Open Source Leadership (Eclipse Foundation) organisation
  Vendor-neutral steward hosting 450+ projects including Jakarta EE and Adoptium, funded by 300+ members
  Governance Nonprofit Project Funding #
• The Mozilla Manifesto (Mozilla) article
  Ten principles on internet openness and privacy, plus the 2017 Pledge for a Healthy Internet
  Advocacy Governance Privacy #
• KDE e.V. Homepage (KDE e.V.) organisation
  Registered non-profit handling KDE's legal and financial affairs, membership and patron sponsorship
  Desktop Environment Governance Nonprofit Project Funding #
• GNOME Foundation (GNOME Foundation) organisation
  Nonprofit holding GNOME's funds, trademarks and infrastructure; elected board and annual reports
  Desktop Environment Governance Nonprofit #
• NLnet; Welcome to NLnet Foundation (nlnet.nl) organisation
  Dutch foundation issuing grants to open internet, open standards and privacy projects since 1997
  Advocacy Nonprofit Project Funding #
• FSFE - Free Software Foundation Europe (FSFE - Free Software Foundation Europe) news
  European charity founded 2001, pressing for user control of technology in EU and national politics
  Advocacy Governance Nonprofit #
• Open Source Security Foundation – Linux Foundation Projects (openssf.org) organisation
  Linux Foundation body coordinating OSS security best practices, free secure-coding courses and tooling
  Nonprofit Security Hardening Supply Chain Security #
• Choose an open source license (Choose a License) reference
  Side-by-side of MIT, GPLv3 and others by what each permits, with well-known projects using them
  Copyleft License Compliance Licensing #
• SPDX License List | Software Package Data Exchange (SPDX) (spdx.org) reference
  Canonical short identifiers, full texts and permanent URLs for licences found in code, data and hardware
  License Compliance Licensing Supply Chain Security #
• copyleft-next (next.copyleft.org) reference
  Open drafting project for a rewritten, shorter copyleft licence; editors Fontana and Kuhn, hosted by SFC
  Copyleft Governance Licensing #
• REUSE - Make licensing easy for everyone (reuse.software) reference
  FSFE three-step recipe for per-file copyright and SPDX headers, machine-checkable in CI
  License Compliance Licensing Supply Chain Security #
• The Open Source Definition (Open Source Initiative) reference
  Ten distribution criteria a license must meet to qualify: redistribution, source, derived works
  License Compliance Licensing #
• Debian Social Contract (debian.org) reference
  The DFSG and Debian's five promises; the text the Open Source Definition was derived from
  Debian Governance Licensing #
• Contributor Covenant | A Code of Conduct for Digital Communities (contributor-covenant.org) reference
  the most widely adopted community conduct text, with an interactive builder for tailoring it
  Advocacy Governance #
• Developer Certificate of Origin (developercertificate.org) reference
  Verbatim v1.1 text of what a contributor certifies by adding a Signed-off-by line to a patch
  Governance License Compliance Version Control #
• BadgeApp (bestpractices.dev) tool
  Free self-certification app where FLOSS projects answer OpenSSF criteria to earn a passing badge
  Code Quality Supply Chain Security Web Application #
• The Cathedral and the Bazaar (catb.org) article
  Raymond's evolving essays on bazaar-style development, hacker history and open-source economics
  Advocacy Governance Hacker Culture #
• How To Become A Hacker (catb.org) article
  ESR's long-running FAQ on the hacker mindset, skills worth learning and status in the gift culture
  Advocacy Hacker Culture #
• Raise, manage and disburse money with full transparency. (opencollective.com) tool
  Fiscal hosting with public ledgers for unincorporated projects; nonprofit hosts in the US, EU, UK, NZ
  Governance Nonprofit Project Funding #
• Home | Sovereign Tech Agency (Sovereign Tech Agency) organisation
  German public fund investing in maintenance of the open libraries and tools other software rests on
  Advocacy Project Funding #
• Home (OpenSSF Scorecard) tool
  Automated repo checks (branch protection, pinned deps, signing) run as GitHub Action or CLI
  Code Quality Supply Chain Security Vulnerability #
• OSV - Open Source Vulnerabilities (osv.dev) dataset
  advisories keyed precisely to affected package versions and commits, aggregated from GHSA, PyPA, RustSec
  Package Manager Supply Chain Security Vulnerability #
• Free software is a matter of liberty, not price — Free Software Foundation — Working together for free software (fsf.org) organisation
  Mission and campaigns of the GNU steward: liberty over price, against DRM and software patents
  Advocacy Copyleft Licensing Nonprofit #
• KiTTY (9bis.net)
  PuTTY fork adding session management and scripting, Windows
  SSH Terminal Emulator Windows #
• Ghostty (Ghostty)
  Native GPU-accelerated terminal emulator, MIT-licensed
  Command Line Terminal Emulator #
• tmux Wiki (GitHub)
  tmux terminal multiplexer, ISC-licensed, session persistence
  Command Line Terminal Multiplexer #
• OpenSSH (openssh.org) tool
  BSD-licensed suite from the OpenBSD project: sshd, scp, sftp, agent, key tools and tunnelling
  Authentication Encryption SSH #
• MobaXterm free Xserver and tabbed SSH client for Windows (mobaxterm.mobatek.net) tool
  one portable Windows exe bundling SSH, RDP, VNC, an X server and bash/rsync/awk; free Home Edition
  Remote Desktop SSH Terminal Emulator Windows #
• GitHub - kingToolbox/WindTerm: A professional cross-platform SSH/Sftp/Shell/Telnet/Tmux/Serial terminal. (GitHub) repo
  Free for commercial use, partly Apache-licensed; saved sessions and binaries for Windows, Linux, macOS
  Connection Manager SSH Terminal Emulator Windows #
• Termius - Modern SSH Client (termius.com) tool
  Syncs saved hosts, keys, snippets and SFTP across desktop and mobile; commercial, free personal tier
  Connection Manager Mobile Shell SSH #
• GitHub - Eugeny/tabby: A terminal for a more modern age (GitHub) repo
  Electron client bundling SSH, Telnet and serial sessions, saved-host manager and encrypted secret store
  Connection Manager SSH Terminal Emulator Windows #
• XPipe - Your entire server infrastructure at your fingertips (xpipe.io) tool
  Desktop hub for SSH, Docker, K8s and VM shells with local encrypted vault; free tier plus paid licence
  Connection Manager Container SSH #
• Ásbrú Connection Manager (asbru-cm.net) tool
  GPL organiser for saved SSH and telnet sessions with task automation; .deb, .rpm and AUR builds
  Connection Manager SSH #
• Bitvise SSH Client | Bitvise (bitvise.com) tool
  Windows GUI SFTP, terminal and tunnelling client; Kerberos SSO, RDP forwarding, proprietary but free to use
  File Transfer SSH Terminal Emulator Windows #
• mRemoteNG (mremoteng.org) tool
  Tabbed Windows client holding RDP, VNC, SSH and HTTP/S sessions in one saved-hosts tree
  Connection Manager Remote Desktop SSH Windows #
• GitHub - kovidgoyal/kitty: If you live in the terminal, kitty is made for you! Cross-platform, fast, feature-rich, GPU based. (GitHub) repo
  cross-platform terminal that renders through the GPU, with multiplexing built in
  Command Line Terminal Emulator Terminal Multiplexer #
• Alacritty - A cross-platform, OpenGL terminal emulator (alacritty.org) tool
  GPU-rendered and deliberately minimal: vi mode, regex hints, scrollback search; BSD, macOS, Windows too
  Command Line Terminal Emulator #
• WezTerm - Wez's Terminal Emulator (wezterm.org) tool
  Rust GPU-accelerated terminal that also multiplexes panes and tabs over SSH; Linux, macOS, Win, BSD
  SSH Terminal Emulator Terminal Multiplexer #
• An overview on Windows Terminal (learn.microsoft.com) reference
  Tabbed GPU-rendered host for CMD, PowerShell and WSL shells; MIT-licensed, Microsoft-maintained
  Command Line Terminal Emulator Windows #
• iTerm2 - macOS Terminal Replacement (iterm2.com) tool
  GPLv2 successor to iTerm for macOS 12.4+, free with source on GitHub
  macOS Terminal Emulator #
• Termux (Termux) tool
  Rootless Android app with an APT package set: bash, OpenSSH, python, rsync and man pages on a phone
  Command Line Mobile Shell Package Manager Terminal Emulator #
• Blink Shell is a professional, desktop grade terminal for iOS. With Mosh & SSH clients for iOS, local UNIX tools, lightning fast and fully customizable. The best terminal for iOS and iPadOS. (blink.sh) tool
  Mosh-based iOS and iPadOS terminal whose sessions survive network changes and sleep; local UNIX tools
  Mobile Shell SSH Terminal Emulator #
• Mosh: the mobile shell (Mosh) tool
  UDP-based SSH replacement surviving roaming and sleep, with local echo; GNU/Linux through iOS
  Command Line Mobile Shell SSH #
• Eternal Terminal (Eternal Terminal) tool
  shell set up over SSH that survives outages and IP roaming, keeping tmux control mode and scrollback
  Mobile Shell SSH Terminal Multiplexer #
• sshuttle 1.3.2 documentation (sshuttle.readthedocs.io) reference
  Routes TCP and DNS through an ordinary SSH login, needing only Python on the remote host
  Network Routing SSH VPN #
• Remmina remote desktop client (Remmina) tool
  Copyleft GTK client for RDP, VNC and SSH with remote file sharing; 67 languages, 50+ distributions
  File Transfer Remote Desktop SSH #
• RustDesk: Open-Source Remote Desktop with Self-Hosted Server Solutions (RustDesk) tool
  TeamViewer alternative with an optional self-hosted Docker relay and a paid Pro tier; Wayland support
  Container Remote Desktop Self Hosting #
• GitHub - jtesta/ssh-audit: SSH server & client security auditing (banner, key exchange, encryption, mac, compression, compatibility, security, etc) (GitHub) repo
  Python scanner grading key exchange, host key, cipher and MAC algorithms against hardening policies
  Penetration Testing Security Hardening SSH #
• lore.kernel.org (lore.kernel.org)
  Public archive of the Linux kernel development mailing lists
  Hacker Culture Kernel #
• Debian Wiki (wiki.debian.org)
  Community-maintained documentation for Debian systems
  Debian Distro #
• Debian -- About Debian (debian.org) article
  Volunteer association behind a 70000-package OS running Linux, FreeBSD or Hurd kernels with GNU userland
  Debian Distro Package Manager #
• Arch Linux - About (archlinux.org) tool
  Independent rolling-release x86-64 distro: minimal base, shell-file config, pacman and the AUR
  Arch Linux Distro Package Manager #
• Fedora Linux (fedoraproject.org) tool
  Red Hat's upstream community distro: GNOME Workstation plus alternative spins, forums and contributor docs
  Desktop Environment Distro #
• openSUSE - Free Linux operating systems for desktops, servers and containers (openSUSE - Free Linux operating systems for desktops, servers and containers) tool
  Leap and Tumbleweed flavours: rolling or immutable, Btrfs snapshots, full-disk encryption, opt-in codecs
  Desktop Environment Distro #
• About the Ubuntu project | Ubuntu (Ubuntu) article
  Origin of the project, Mark Shuttleworth's founding role and how Canonical stewards the distribution
  Debian Distro #
• About Linux Mint - Linux Mint (linuxmint.com) article
  Ubuntu-based desktop distribution pitched at Windows and macOS switchers; project history from 2006 onward
  Debian Desktop Environment Distro #
• About Gentoo – Gentoo Linux (gentoo.org) reference
  Source-based metadistribution compiled and tuned per machine via Portage; elected council governance
  Build From Source Distro Gentoo #
• The Revised Slackware Book Project (slackbook.org) reference
  Community rewrite of Slackware Linux Essentials; CC BY-SA, DocBook sources in git, beta readable
  Distro Slackware #
• about | Alpine Linux (alpinelinux.org) article
  musl and BusyBox base sized for containers: apk packaging, OpenRC init, PIE-hardened userland
  Container Distro Security Hardening #
• Nix & NixOS | Declarative builds and deployments (nixos.org) tool
  Isolated reproducible builds, safe rollbacks and declarative machine config; 140,000+ Nixpkgs packages
  Configuration Management Distro Nix Package Manager #
• Qubes OS: A reasonably secure operating system (Qubes OS) tool
  Compartmentalises work into Xen VMs, with Whonix for anonymity and room for a Windows guest
  Anonymity Distro Security Hardening Virtualization #
• Tails - How Tails works (tails.net) tool
  Amnesic live USB system that leaves nothing on disk and pushes all traffic through Tor
  Anonymity Distro Privacy #
• What is Kali Linux? | Kali Linux Documentation (Kali Linux) reference
  Debian-based distribution preloading hundreds of offensive-security, forensics and reversing tools
  Debian Distro Penetration Testing #
• DistroWatch.com: Put the fun back into computing. Use Linux, BSD. (distrowatch.com) reference
  index of hundreds of Linux and BSD distributions, browsable one by one from a single selector
  Distro Hacker Culture #
• The Linux Kernel Archives (kernel.org) reference
  Official mainline, stable and longterm source tarballs with PGP signatures, git trees and mirrors
  Build From Source Kernel #
• ArchWiki (wiki.archlinux.org) reference
  Install guide, application indexes and deep configuration articles used well beyond Arch itself
  Arch Linux Configuration Management Distro #
• Gentoo Wiki (wiki.gentoo.org) reference
  Community-editable docs hub: handbooks, portage and project pages for installing and running Gentoo
  Build From Source Distro Gentoo #
• Linux man pages online (man7.org) reference
  HTML renderings of the man-pages project plus curated pages from other free software projects
  Command Line Kernel Unix Standard #
• The Linux Documentation Project (tldp.org) reference
  Ageing archive of HOWTOs, book-length guides, FAQs, man pages and Linux Gazette, with translations
  Command Line Hacker Culture #
• Welcome to LWN.net [LWN.net] (lwn.net) news
  Subscriber-funded reporting on kernel development, distributions and free-software community affairs
  Hacker Culture Kernel #
• Welcome to Linux From Scratch! (linuxfromscratch.org) reference
  book set for building a system from source: base LFS plus beyond, automated, multilib and gaming variants
  Build From Source Distro Kernel #
• The Missing Semester of Your CS Education (Missing Semester) tutorial
  MIT lecture series on shell, editors, git, debugging and profiling that degree courses skip
  Command Line Shell Scripting Version Control #
• BashGuide - Greg's Wiki (mywiki.wooledge.org) tutorial
  Beginner bash walkthrough stressing good practice and quoting pitfalls; assumes no prior Unix skill
  Command Line Shell Scripting #
• ShellCheck – shell script analysis tool (shellcheck.net) tool
  Catches quoting, portability and logic bugs in bash/sh; paste a script into the browser or run it locally
  Code Quality Command Line Shell Scripting #
• The Austin Common Standards Revision Group (opengroup.org) reference
  Joint IEEE/ISO/Open Group body drafting POSIX and Base Specifications revisions; draft status news
  Governance Unix Standard #
• FHS Referenced Specifications (refspecs.linuxfoundation.org) reference
  Downloadable FHS 3.0 and 2.3 texts fixing where files belong in the directory tree; 3.0 dates to 2015
  Filesystem Unix Standard #
• Linux_Kernel_Newbies - Linux Kernel Newbies (kernelnewbies.org) reference
  Wiki, list and IRC for aspiring kernel hackers: first-patch tutorial, subsystem map, plain changelogs
  Kernel Version Control #
• musl libc (musl.libc.org) tool
  Small standards-conformant C library over the Linux syscall API; static-friendly, with CVE advisories
  libc Unix Standard #
• smartmontools (smartmontools.org)
  Monitors disk health through SMART attributes and self-tests
  Hardware Observability #
• Netdata: Monitoring and troubleshooting transformed (netdata.cloud) tool
  Per-second metrics, dashboards and alerts from an open agent; paid managed and on-prem cloud tiers
  Observability Performance Analysis Self Hosting #
• Zabbix: The enterprise-class open source observability solution (zabbix.com) tool
  Agent-based monitoring and alerting for hosts, networks and apps; GPL core, paid support and SaaS
  Network Diagnostic Observability Self Hosting #
• Prometheus - Monitoring system & time series database (prometheus.io) tool
  dimensional metrics model queried with PromQL, alerting via Alertmanager; standalone Go binary, local storage
  Observability Performance Analysis #
• Grafana OSS | Leading observability tool for visualizations & dashboards (Grafana Labs) tool
  Dashboards and alerting across 150+ data sources, deployable as code; OSS build beside paid Cloud
  Observability Self Hosting Web Application #
• GitHub - louislam/uptime-kuma: A fancy self-hosted monitoring tool (GitHub) repo
  HTTP, TCP, DNS, ping and Docker checks at 20s intervals, status pages and 90+ notification services
  Observability Self Hosting Web Application #
• restic · Backups done right! (restic.net) tool
  Single-binary deduplicating backup to local, SFTP or cloud storage, encrypted and restore-verifiable
  Backup Command Line Encryption #
• BorgBackup – Deduplicating archiver with compression and authenticated encryption (borgbackup.org) tool
  Content-defined chunking, FUSE-mountable archives, untrusted remote repos; BSD-licensed, Linux/macOS/BSD
  Backup Command Line Encryption #
• Rclone (Rclone) tool
  rsync-style copy, sync and mount across 70+ cloud storage backends, with checksums and --dry-run
  Backup Command Line File Synchronization File Transfer #
• Syncthing (syncthing.net) tool
  Peer-to-peer continuous sync with no central server; TLS-secured, devices authorised by certificate
  Encryption File Synchronization Privacy #
• GitHub - aristocratos/btop: A monitor of resources (GitHub) repo
  C++ rewrite of bashtop/bpytop with mouse support, themes and GPU stats; Linux, macOS and BSD
  Command Line Performance Analysis #
• The Logfile Navigator (The Logfile Navigator) tool
  auto-detects log formats, unpacks compressed files and queries them through SQLite; no server or setup
  Command Line Logging Text Processing #
• GitHub - junegunn/fzf: :cherry_blossom: A command-line fuzzy finder (GitHub) repo
  Single binary with Bash, Zsh, Fish and Vim bindings; also a toolkit for interactive terminal UIs
  Command Line Shell Scripting Text Processing #
• jq (jqlang.org) tool
  sed for JSON: slice, filter and reshape structured data; portable C, dependency-free single binary
  Command Line Text Processing #
• bpftrace: dynamic tracing for Linux | bpftrace (bpftrace.org) tool
  Awk-like language for writing eBPF probes without touching the raw eBPF toolchain, plus a tool collection
  eBPF Kernel Performance Analysis #
• Brendan Gregg's Homepage (brendangregg.com) personal-site
  Flame graphs, eBPF tracing methods, talks and slides from a datacenter performance engineer
  eBPF Kernel Performance Analysis #
• Nmap: the Network Mapper - Free Security Scanner (nmap.org) tool
  Port scanning and host discovery for network inventory and auditing; ships Npcap for Windows capture
  Network Diagnostic Packet Capture Penetration Testing #
• Wireshark • Go Deep (Wireshark) tool
  Captures live traffic and dissects hundreds of protocols interactively; GPL, cross-platform
  Network Diagnostic Packet Capture #
• Home | TCPDUMP & LIBPCAP (tcpdump.org) tool
  Upstream releases, man pages and filter syntax for the pcap capture library and its analyzer
  Command Line Network Diagnostic Packet Capture #
• GitHub - traviscross/mtr: Official repository for mtr, a network diagnostic tool (GitHub) repo
  traceroute and ping in one: probes each hop and prints running loss and latency statistics; GPLv2 C source
  Command Line Network Diagnostic #
• iperf3 — iperf3 3.21 documentation (software.es.net) reference
  Active TCP/UDP throughput measurement with tunable buffers and JSON output; not compatible with iperf2
  Command Line Network Diagnostic Performance Analysis #
• Partition Recovery and File Undelete (CGSecurity) tool
  GPLv2 rescue of lost partitions and boot sectors, plus PhotoRec undelete across FAT, NTFS and ext
  Command Line Data Recovery Filesystem #
• OpenZFS Documentation — OpenZFS documentation (openzfs.github.io) reference
  Per-platform install and admin material for ZFS pools, datasets, snapshots and contributor internals
  Backup Filesystem ZFS #
• Ansible Community | Ansible documentation (docs.ansible.com) reference
  Official docs for the agentless YAML automation engine: core language, collections, ecosystem tools
  Configuration Management Infrastructure As Code #
• OpenTofu (opentofu.org) tool
  Linux Foundation-stewarded Terraform fork, drop-in compatible, with 3,900+ community providers
  Configuration Management Infrastructure As Code #
• cloud-init 26.2 documentation (docs.cloud-init.io) reference
  First-boot provisioning across clouds and bare metal: networking, storage, SSH keys, packages
  Configuration Management Infrastructure As Code #
• System and Service Manager (systemd.io) tool
  Upstream home of PID 1: service manager plus journald, networkd, resolved and the unit ecosystem
  Init System Logging #
• rsyslog – the rocket-fast system for log processing pipelines (rsyslog) tool
  collects, transforms and routes event data at high volume; 100+ input/output modules, plus a Windows agent
  Logging Observability #
• explainshell.com - match command-line arguments to their help text (explainshell.com) tool
  Paste a command line and get every flag mapped back to the matching part of its man page
  Command Line Shell Scripting Web Application #
• cheat.sh/:firstpage (cheat.sh) tool
  Cheat sheets fetched by curl or the cht.sh client, covering unix commands and 60+ languages
  Command Line Shell Scripting #
• Headscale (headscale.net)
  Self-hosted implementation of the Tailscale coordination server
  Self Hosting VPN #
• Proxmox Virtual Environment (Proxmox) tool
  KVM hypervisor plus LXC containers under one web UI, with clustering, HA and software-defined storage
  Container Homelab Virtualization #
• TrueNAS 27 (Early) (truenas.com) reference
  Docs for the ZFS-based NAS operating system; this branch tracks unreleased nightly builds
  NAS Self Hosting ZFS #
• XCP-ng - XenServer Based, Community Powered (xcp-ng.org) tool
  Xen-based hypervisor with live VM migration, web Xen Orchestra management and a VMware migration path
  Homelab Self Hosting Virtualization #
• openmediavault - DATA SOVEREIGNTY MADE EASY (openmediavault.org) tool
  Debian-based NAS OS with plugin-extensible web admin for SMB, SFTP, rsync and RAID repair
  Debian NAS Self Hosting #
• Linux Containers - Incus - Introduction (linuxcontainers.org) reference
  Community-run LXD fork managing system containers and VMs side by side through one REST API and CLI
  Command Line Container Virtualization #
• What is Docker? (Docker Documentation) reference
  Vendor explainer of containers as isolation and packaging units, plus the client/daemon platform around them
  Container Virtualization #
• Podman (podman.io) tool
  Daemonless, rootless OCI container engine with pods and Kubernetes-compatible local workflows
  Command Line Container Kubernetes #
• Welcome | Portainer Documentation (docs.portainer.io) reference
  container management UI docs spanning Docker, Swarm, Podman and Kubernetes; free CE, licensed BE
  Container Kubernetes Web Application #
• K3s (k3s.io) tool
  Sub-70MB single-binary certified Kubernetes aimed at ARM boards, edge sites and constrained nodes
  Container Homelab Kubernetes #
• Caddy - The Ultimate Server with Automatic HTTPS (Caddy Web Server) reference
  Go server configured by Caddyfile or JSON API, no runtime deps; getting-started and quick starts
  Reverse Proxy Self Hosting Web Server #
• Traefik Proxy Documentation - Traefik (doc.traefik.io) reference
  Container-aware routing: discovers Docker and Kubernetes backends automatically, no restarts, TLS included
  Container Kubernetes Reverse Proxy #
• Nginx Proxy Manager (nginxproxymanager.com) tool
  Web UI over nginx for proxy hosts, access lists and self-renewing Let's Encrypt certificates
  Reverse Proxy Self Hosting Web Application #
• WireGuard: fast, modern, secure VPN tunnel (wireguard.com) tool
  In-kernel tunnel with modern crypto, leaner than IPsec and OpenVPN; also on Windows, macOS, BSD, mobile
  Encryption Network Routing VPN #
• OPNsense® is an open source, feature rich firewall and routing platform, offering cutting-edge network protection. - OPNsense (OPNsense) tool
  FreeBSD-based firewall/router platform: multi-WAN, IPsec/OpenVPN/WireGuard, CARP failover, NetFlow reporting
  Network Routing Security Hardening VPN #
• Pi-hole – Network-wide Ad Blocking (pi-hole.net) tool
  DNS sinkhole you run yourself; point router DHCP at it to filter every device, VPN included
  Ad Blocking DNS Self Hosting #
• AdGuard Home | Network-wide software for any OS: Windows, macOS, Linux (adguard.com) tool
  network-wide DNS filtering of ads and trackers for every device, router-installable, with parental controls
  Ad Blocking DNS Privacy Self Hosting #
• Welcome | authentik (goauthentik.io) tool
  Self-hosted SSO speaking SAML, OAuth2 and LDAP, with customisable auth flows and policy as code
  Authentication Self Hosting Web Application #
• Authelia (Authelia) tool
  OpenID Certified SSO and multi-factor portal that reverse proxies delegate login to; ~20MB Go binary
  Authentication Reverse Proxy Self Hosting #
• GitHub - dani-garcia/vaultwarden: Unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs (GitHub) repo
  Lightweight Rust reimplementation of the Bitwarden API for self-hosting; works with the stock clients
  Container Password Manager Self Hosting #
• Nextcloud - Open source content collaboration platform (Nextcloud) tool
  Self-hosted hub of file sync, Talk conferencing, groupware and LibreOffice-based online editing
  File Synchronization Office Suite Self Hosting #
• Quick start | Immich (docs.immich.app) reference
  Docker Compose path to a self-hosted photo and video backup server; needs 6GB RAM and two cores
  Backup Container Media Server Self Hosting #
• The Free Software Media System | Jellyfin (jellyfin.org) tool
  GPL server for streaming your own video, music and books; no tracking, no paid tier, donation funded
  Media Player Media Server Self Hosting #
• Home Assistant (Home Assistant) tool
  Locally-run device automation hub, governed by the non-profit Open Home Foundation
  Home Automation Privacy Self Hosting #
• GitHub - paperless-ngx/paperless-ngx: A community-supported supercharged document management system: scan, index and archive all your documents (GitHub) repo
  OCR pipeline turning scanned paper into a searchable archive; docker compose deploy, live demo
  Document Management Self Hosting Web Application #
• Forgejo – Beyond coding. We forge. (forgejo.org) tool
  Lightweight Git forge run by nonprofit Codeberg e.V.; Gitea fork focused on federation and privacy
  Nonprofit Self Hosting Version Control #
• linkding (linkding) tool
  Single Docker container on SQLite; metadata fetching, page snapshots, REST API, multi-user sharing
  Bookmark Manager Self Hosting Web Application #
• awesome-selfhosted (awesome-selfhosted.net) reference
  Tag-browsable catalogue of network services and web apps runnable on your own server, with licence and stars
  Homelab Self Hosting Web Application #
• Home | LinuxServer.io (linuxserver.io) tool
  Group maintaining s6-overlay Docker images on a shared base, auto-rebuilt when upstreams change
  Container Homelab Self Hosting #
• selfh.st - Self-hosted content and software (selfh.st) news
  Weekly newsletter, release notes and app index tracking what people run on their own servers
  Homelab Self Hosting #
• GNOME (gnome.org) tool
  Desktop stack shipped by default on RHEL, Ubuntu, Debian and Fedora; app platform and design system
  Desktop Environment Wayland #
• Plasma (kde.org) tool
  KDE's Qt-based desktop shell; customisable panels, widgets and the KWin compositor
  Desktop Environment Window Manager #
• Xfce Desktop Environment (xfce.org) tool
  lightweight GTK desktop for UNIX-like systems, tuned for low resource use; roughly two-year release cadence
  Desktop Environment Window Manager #
• Hyprland: Dynamic tiling window compositor with the looks (hypr.land) tool
  Wayland compositor with live config reload, plugins, animations and multiple tunable tiling layouts
  Wayland Window Manager #
• Sway (swaywm.org) tool
  Drop-in i3 replacement on Wayland: existing i3 configs work, keyboard-driven tiling, wlroots-based
  Wayland Window Manager #
• Wayland (wayland.freedesktop.org) tool
  Display protocol and libwayland IPC; no single server, each desktop ships its own compositor
  Desktop Environment Wayland Window Manager #
• PipeWire (pipewire.org) tool
  Low-latency graph engine replacing PulseAudio and JACK, sandbox-safe for Flatpak apps
  Audio Desktop Environment #
• Flatpak (Flatpak) tool
  Sandboxed app bundles on shared runtimes, distributed via Flathub; one build for every distro
  Desktop Environment Distro Package Manager #
• Flathub - Apps for Linux (flathub.org) tool
  Cross-distribution Flatpak store: browse trending and new desktop apps, plus per-distro setup steps
  Desktop Environment Package Manager #
• AppImage (appimage.org) tool
  Single-file bundle format: download, chmod +x, run, with no install and no per-distro packaging
  Desktop Environment Package Manager #
• Snapcraft - Snaps are universal Linux packages (Snapcraft) tool
  Canonical's app store and packaging format: dependencies bundled, auto-updating, same across distributions
  Distro Package Manager #
• Preface - Home Manager Manual (nix-community.github.io) reference
  Managing a user's dotfiles, packages and services declaratively with Nix, on NixOS or any distro
  Configuration Management Nix Package Manager #
• Homebrew (Homebrew) tool
  Formulae and casks for macOS, Linux and WSL; taps let anyone publish outside the reviewed core repo
  Command Line macOS Package Manager #
• LibreOffice (libreoffice.org) tool
  Cross-platform office suite built by a volunteer community under The Document Foundation
  Document Management Nonprofit Office Suite #
• GIMP (GIMP) tool
  Cross-platform raster retouching and compositing, scriptable in Python and Scheme via plugins
  Digital Art Image Editing #
• Digital Painting. Creative Freedom. (Krita) tool
  GPL painting program with brush engines, layers, assistants and animation; Linux, Windows, macOS
  Digital Art Image Editing #
• Blender - The Free and Open Source 3D Creation Software — blender.org (Blender) tool
  GPL 3D suite: modelling, sculpting, UV, Cycles path-tracing, VFX and Python-scriptable tooling
  Digital Art Video Editing #
• darktable (darktable) tool
  Raw developer and photo workflow manager; non-destructive edits over a database of negatives
  Digital Art Image Editing #
• Kdenlive - Free and Open Source Video Editor (Kdenlive) tool
  KDE's non-linear editor, also running on Windows, macOS and BSD; KDE-versioned quarterly releases
  Digital Art Video Editing #
• Open Broadcaster Software | OBS (obsproject.com) tool
  Scene-based capture and mixing for recording or streaming; per-source audio filters, VST, plugins
  Audio Video Editing #
• mpv.io (mpv.io) tool
  Minimal player driven by Lua scripts, with GPU decoding, OpenGL/Vulkan output and embeddable C API
  Command Line Media Player #
• calibre - E-book management (calibre-ebook.com) tool
  E-book library organiser, format converter and reader; donation-funded, led by a single developer
  Document Management Media Player #
• Thunderbird — Free Your Inbox. (Thunderbird) tool
  Donation-funded desktop client unifying mail, calendar, contacts and chat; no ads or data collection
  Email Privacy #
• Neovim (Neovim) tool
  Vim fork with built-in Lua, an embedding API and external UIs; Vimscript and Vim 8 plugins still work
  Command Line Text Editor #
• KeePassXC Password Manager (keepassxc.org) tool
  Offline encrypted KDBX vault for Windows, macOS and Linux; no cloud or subscription, ANSSI-certified
  Encryption Password Manager Privacy #
• VeraCrypt - Free Open source disk encryption with strong security for the Paranoid (veracrypt.io) tool
  TrueCrypt 7.1a successor with 200k-iteration KDF, hidden volumes and full system-partition setup
  Encryption Filesystem Security Hardening #
• The GNU Privacy Guard (gnupg.org) tool
  command-line OpenPGP implementation with key management, S/MIME and ssh support; Gpg4win for Windows
  Command Line Email Encryption #
• Signal Messenger: Speak Freely (Signal Messenger) tool
  Encrypted chat, voice and video over mobile data using the Signal Protocol; no ads or tracking
  Encryption Privacy #
• The Tor Project | Privacy & Freedom Online (torproject.org) tool
  US nonprofit behind the three-hop volunteer relay network and the fingerprint-resistant Tor Browser
  Anonymity Nonprofit Privacy Web Browser #
• ClamAVNet (clamav.net) tool
  Signature-based malware scanner with daemon, CLI tools and auto-updating definitions; mail-gateway staple
  Email Security Hardening Vulnerability #
• LibreWolf Browser (librewolf.net) tool
  Firefox rebuild with telemetry and DRM stripped, uBlock Origin bundled and hardened defaults
  Ad Blocking Privacy Security Hardening Web Browser #
• uBlock Origin - Free, open-source ad blocker extension (uBlock Origin) tool
  Wide-spectrum filtering extension; Chrome's Manifest V3 killed the full version, Firefox keeps it
  Ad Blocking Privacy Web Browser #
• About RTL-SDR (rtl-sdr.com) article
  ~$30 RTL2832U DVB-T dongle repurposed as a receive-only 500 kHz-1.75 GHz software radio
  Hardware Software Defined Radio #
• The Linux Kernel documentation — The Linux Kernel documentation (kernel.org) reference
  Top level of the in-tree docs: development process, internal APIs, userspace ABI, per-architecture notes
  Hardware Kernel #
• systemd - ArchWiki (wiki.archlinux.org) reference
  Unit files, targets, journalctl and service control as practised on Arch
  Arch Linux Init System #