Xemacs

text, tool (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.

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 freesoftware, 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)