GNU is a project to create a GPL-licensed UNIX that was started by Richard Stallman, the creator of EMACS. The GNU project is now overseen by the Free Software Foundation, which Richard Stallman founded.

GNU is a recursive acronym, and it stands for GNU's Not Unix. This, no doubt, is because of Richard Stallman's grounding in Lisp.

The GNU Project has created a great many software packages, including gcc, sed, glibc, make, awk, find, file, and a good deal more besides. These packages make up a major portion of every Linux distribution.

The development of the GNU operating system, the Hurd, continues.