XEmacs是GNU Emacs的分支，至今仍保持着相当的兼容性，并已移植到Windows操作系统。

XEmacs使用 Emacs Lisp 的强大扩充性的编程语言，从而实现了包括程设、编译乃至网络浏览等等功能的扩展。XEmacs最著名的功能是处理多国语言，而且能在同一份文档中同时处理多种不同语文。

XEmacs is a graphical- and console-based text editor which runs on almost any Unix-like operating system as well as Microsoft Windows. XEmacs is a fork, based on a version of GNU Emacs from the late 1980s. Any user can download, use, and modify XEmacs as free software available under the GNU General Public License version 2 or any later version.