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  Xemacs
       
           (Originally "Lucid Emacs") A text editor for the
          X Window System, based on GNU Emacs version 19, produced
          by a collaboration of Lucid, Inc., SunPro (a division of
          Sun Microsystems, Inc.), and the University of Illinois.
       
          Energize,+their+C/{C++" rel="nofollow">Lucid chose to build part of Energize, their C/{C++
          development environment on top of GNU Emacs.  Though their
          product is commercial, the work on GNU Emacs is free
          software, and is useful without having to purchase the
          product.  They needed a version of Emacs with mouse-sensitive
          regions, multiple fonts, the ability to mark sections of a
          buffer as read-only, the ability to detect which parts of a
          buffer has been modified, and many other features.
       
          The existing version of Epoch was not sufficient; it did not
          allow arbitrary pixmaps and icons in buffers, "undo" did
          not restore changes to regions, regions did not overlap and
          merge their attributes.  Lucid spent some time in 1990 working
          on Epoch but later decided that their efforts would be better
          spent improving Emacs 19 instead.
       
          Lucid did not have time to get their changes accepted by the
          FSF so they released Lucid Emacs as a forked branch of
          Emacs.  Roughly a year after Lucid Emacs 19.0 was released, a
          beta version of the FSF branch of Emacs 19 was released.
          Lucid continued to develop and support Lucid Emacs, merging in
          bug fixes and new features from the FSF branch as appropriate.
       
          A compatibility package was planned to allow Epoch 4 code to
          run in Lemacs with little or no change.  (As of 19.8, Lucid
          Emacs ran a descendant of the Epoch redisplay engine.)
       
          [Update?]
       
          (2000-05-16)