Debian (10)

• 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
  System Administration #
• About this project (The Debian Administrator's Handbook) reference
  Debian sysadmin book by two Debian developers; free online, DFSG-compatible license, paperback sold
  System Administration #
• Debian Reference (debian.org) reference
  post-installation overview of the Debian system, covering admin tasks through shell-command examples
  Command Line System Administration #
• Debian Social Contract (debian.org) reference
  The DFSG and Debian's five promises; the text the Open Source Definition was derived from
  Governance Licensing #
• Debian Wiki (wiki.debian.org)
  Community-maintained documentation for Debian systems
  Distro #
• Debian -- About Debian (debian.org) article
  Volunteer association behind a 70000-package OS running Linux, FreeBSD or Hurd kernels with GNU userland
  Distro Package Manager #
• About the Ubuntu project | Ubuntu (Ubuntu) article
  Origin of the project, Mark Shuttleworth's founding role and how Canonical stewards the distribution
  Distro #
• About Linux Mint - Linux Mint (linuxmint.com) article
  Ubuntu-based desktop distribution pitched at Windows and macOS switchers; project history from 2006 onward
  Desktop Environment Distro #
• What is Kali Linux? | Kali Linux Documentation (Kali Linux) reference
  Debian-based distribution preloading hundreds of offensive-security, forensics and reversing tools
  Distro Penetration Testing #
• openmediavault - DATA SOVEREIGNTY MADE EASY (openmediavault.org) tool
  Debian-based NAS OS with plugin-extensible web admin for SMB, SFTP, rsync and RAID repair
  NAS Self Hosting #