From the official site: "An alternative to GNU Emacs, XEmacs was originally based on an early alpha version of FSF's version 19, and has diverged quite a bit since then. XEmacs was known as Lucid Emacs through version 19.10. Almost all features of GNU Emacs are supported in XEmacs. The maintainers of XEmacs actively track changes to GNU Emacs while also working to add new features."
How XEmacs (Lucid Emacs as was) came about, by Jamie Zawinski: '[t]his incident has become famous as one of the most significant "forks" in a free software code base'. Edited Highlights of mail-lists as events unfolded.
Official site. Open source text editor for GUI environments. Includes downloads, documentation, getting involved in development and customization. [Linux, Unix, Windows]
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