Debian

Debian is a source and binary distribution of the GNU/Linux system.

http://www.debian.org

See EmacsForDebian for Emacs related things on the Debian system.

On the wiki here you can use a shortcut like DebianPackage:emacs21 to link to a http://packages.debian.org search (for all versions of the package, stable, unstable, testing).

See Also

EmacsSnapshotAndDebian - for details about how to get a very up to date Emacs for Debian