ArchWikiOne of the most complete community-maintained Linux knowledge bases, useful far beyond Arch itself.Blender ManualThe official Blender reference manual, openly licensed and translated by the community.GNU Emacs ManualThe canonical manual of GNU Emacs — documentation that has been continuously maintained since the 1980s.Linux man-pagesThe manual pages documenting the Linux kernel and glibc userspace API — core reference of the ecosystem.The Debian Administrator's HandbookThe reference book for Debian administrators, freely licensed and maintained alongside Debian releases.The Rust Programming Language"The Book" — the official, freely licensed introduction to the Rust programming language.