Front Page — Free Software Foundation — working together for free software
(fsf.org)
organisationNonprofit behind the GPL, running Defective by Design, End Software Patents and email self-defense
Software Freedom Law Center
(softwarefreedom.org)
newslegal counsel for FOSS projects and foundations: licensing, nonprofit structure and code-of-conduct practice
Choose an open source license
(Choose a License)
referenceSide-by-side of MIT, GPLv3 and others by what each permits, with well-known projects using them
SPDX License List | Software Package Data Exchange (SPDX)
(spdx.org)
referenceCanonical short identifiers, full texts and permanent URLs for licences found in code, data and hardware
copyleft-next
(next.copyleft.org)
referenceOpen drafting project for a rewritten, shorter copyleft licence; editors Fontana and Kuhn, hosted by SFC
REUSE - Make licensing easy for everyone
(reuse.software)
referenceFSFE three-step recipe for per-file copyright and SPDX headers, machine-checkable in CI
The Open Source Definition
(Open Source Initiative)
referenceTen distribution criteria a license must meet to qualify: redistribution, source, derived works
Debian Social Contract
(debian.org)
referenceThe DFSG and Debian's five promises; the text the Open Source Definition was derived from
Free software is a matter of liberty, not price — Free Software Foundation — Working together for free software
(fsf.org)
organisationMission and campaigns of the GNU steward: liberty over price, against DRM and software patents