CC Mode is a GNU Emacs and XEmacs mode for editing C and other languages with similar syntax; currently C++, Objective-C, Java, CORBAs IDL, Pike, and AWK. It is a standard package in both GNU Emacs and XEmacs.
Collaborators on a version-controlled .tex file can track changes.
LaTeX Track Changes shows changes over time for a .tex file that has its history stored in a git or svn repository. The user can customize how to view the changes: limited to certain authors or by revision or date among other filters. An Emacs mode provides the user interface. Plug-ins for other editors (such as TeXShop) are planned.
A Multi-Lingual Vocabulary system for GNUemacs, that helps you to learn words in other languages as you use them in your own language. Vocabulary is stored in CSV (spreadsheet) files for easy interchange.
Configuration framework for: emacs, zsh, tcsh, ksh, bash, screen, top, metacity, gnome-terminal,... It run on all posix platform and include special stuff for epita you can find source here: http://github.com/ctaf42/ctafconf
We have moved to http://sv.gnu.org/projects/erc. ERC is a powerful, modular, and extensible IRC client for Emacs and XEmacs. Full documentation can be found on the wiki by following the "Home Page" link.