Description:

XEmacs (and regular GNU Emacs, too) is a self-documenting, customizable,
extensible, real-time display editor. XEmacs is self-documenting because at any
time you can type in control-h to find out what your options are or to find out
what a command does. XEmacs is customizable because you can change the
definitions of XEmacs commands to anything you want. XEmacs is extensible
because you can write entirely new commands--programs in the Lisp language to
be run by Emacs' own Lisp interpreter. XEmacs includes a real-time display,
which means that the text being edited is visible on the screen and is updated
very frequently (usually after every character or pair of characters) as you
type. This version used the GTK widgets