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XEmacs (formerly known as Lucid Emacs) is a powerful, extensible text editor with full GUI support, initially based on an early version of GNU Emacs 19 from the Free Software Foundation and since kept up to ate with recent versions of that product. XEmacs stems from a collaboration of Lucid, Inc. with Sun Microsystems, Inc. and the University of Illinois with additional support having been provided by Amdahl Corporation, INS Engineering Corporation, and a huge amount of volunteer effort.

GNU Libidn is an implementation of the Stringprep, Punycode, and IDNA specifications defined by the IETF Internationalized Domain Names (IDN) working group.
It is used to prepare internationalized strings (such as domain name labels, usernames, and passwords) in order to increase the likelihood that string input and string comparison work in ways that make sense for typical users throughout the world. The library contains a generic Stringprep implementation that does Unicode 3.2 NFKC normalization, mapping and prohibition of characters, and bidirectional character handling. Profiles for iSCSI, Kerberos 5, Nameprep, SASL, and XMPP are included. Punycode and ASCII Compatible Encoding (ACE) via IDNA are supported.

ArX is a flexible, high performance, distributed
revision control system featuring whole-tree
atomic changesets, easy branching, and
sophisticated merging. ArX has always been self
hosting.

ECB is a source code browser for (x)emacs. It
displays a couple of windows that can be used to
browse directories, files, and file contents like
methods and variables. It supports source code
parsing for languages like Java, C, C++, Elisp,
Scheme, Perl, TeX, LaTeX, etc. In addition, it
offers an (optional) permanent "compile window" at
the bottom of the emacs frame, which is used to
display all help and compile output. The rest of
the frame is called the "edit area", which can be
divided into several edit windows that are used
for editing the sources. Deleting some of the edit
windows neither destroys the compile window nor
the browsing windows. It requires the CEDET suite.

The Remembrance Agent (RA) watches your over your shoulder and continuously updates a list of documents relevant to what is being typed or read in an Emacs buffer. Suggestions are then displayed in their own window at the bottom of the frame, and are continually updated every few seconds. The RA uses a multi-field information-retrieval back-end called Savant that can index several different kinds of files, including email archives, HTML, LaTeX, and plain text format.

VM is a mail reader written in Emacs LISP for GNU Emacs and XEmacs. It can retrieve mail from local spool files or remotely via POP and IMAP, display and send MIME messages, thread messages, auto-sort messages into folders, and manipulate "virtual folders" of messages matching certain criteria. In Emacs versions with X support it provides an interface with toolbars, menus, and mouse-based message selection.

mu is a collection of utilities for maildirs, in particular for indexing and searching them. mu fills a database with information about your emails, which can then be queried using an easy query language. It can work stand-alone or be integrated with a mail client. It also provides an emacs-based email client ("mu4e") and bindings for Guile/Scheme.

BHL is an Emacs mode which enables you to convert
plain text files into HTML, LaTeX, Texinfo, SGML
(Linuxdoc), and TXT files. The BHL mode handles
three levels of sections, many sectioning styles,
common font-styles, any kind of lists, tables,
URLs, horizontal rules, and Wiki names. BHL
handles a list of links (lol) and a table of
contents (toc): you can browse the lol and the
toc, insert them where you want, and update the
sections' numbers with one keystroke.

AutOrg aims to be a text editor, personal organizer, local wiki, secure agenda, and everything in between. For the user interface, it gets its inspiration from text-based minimalism, still providing advanced features for publishing, encrypting, and sharing information. It uses Emacs Org-mode and other extensions, and its main binary distribution runs on a Mac OS X desktop.