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Emacs
Emacs is a text editor originally created by Richard Stallman and Guy L. Steele, Jr.
It is often lovingly referred to as its own self-contained operating system.
History
Richard Stallman began writing GNU Emacs in 1984 has a free software alternative to the proprietary Gosling Emacs.
This was the first program released by the GNU Project.
Plan9 doesn't like Emacs. This is the man page for it. Very clearly they are against it. Also this happened.