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The History of XEmacs

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.

More information about the current and past developers of XEmacs, as well as some information about the history of XEmacs development is available within XEmacs by selecting 'About XEmacs...' from the Help menu. Detailed information is available in the NEWS files from each release.

Source: FAQ item 1.0.1