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[1131 users on Ohloh]
Pidgin is an instant messaging program for Windows, Linux, BSD, and other Unixes. You can talk to your friends using AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, and Zephyr.

Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.

[330 users on Ohloh]
The most used console irc client
[321 users on Ohloh]
Unified OS X instant messaging platform
[250 users on Ohloh]
X-Chat is a fully-featured graphical IRC client using the GTK toolkit. It can be compiled to use GNOME and Perl scripting.
Kopete IM Client (KDE)
[226 users on Ohloh]
Kopete is a flexible and extendable multiple protocol instant messaging system designed as a plugin-based system. All protocols are plugins and allow modular installation, configuration, and usage without the main application knowing anything about the plugin being loaded. The goal of Kopete is to provide users with a standard and easy to use interface between all of their instant messaging systems, but at the same time also providing developers with the ease of writing plugins to support a new ...
[99 users on Ohloh]
Psi is a leading instant messaging / real-time communications client for the Jabber network (using the XMPP protocol). It is cross platform, available for Windows, Mac OS X and X11 (Linux, BSD, Solaris etc.) platforms. It uses the Qt library.

It aims to be (and is famous for being) standards compliant and stable. It is also at the cutting edge of XMPP development, with several of the authors very actively involved in the XMPP standards extension process.

[86 users on Ohloh]
Miranda is the next generation Miranda IM client for Windows.
[28 users on Ohloh]
Tags: client irc chat gnome xchat chatting
XChat-GNOME is a new frontend to the popular X-Chat IRC client which is designed with the user interface foremost in mind. Historically, the OSS desktop has been steadily improving in usability, accessibility, and general slickness, yet the world of IRC clients has not kept up.

GNOME’s philosophy in terms of user interfaces has been progressing towards presenting the user with few options and sane defaults.

The authors decided that the GTK+ frontend provided excessive customizability...

RioCar/Empeg Hijack
[0 users on Ohloh]
This project consists of pre-built kernels and patches which provide significant enhancements to the Linux kernel used on RioCar / EmpegCar music players.
[25 users on Ohloh]
Empathy consists of a rich set of reusable instant messaging widgets, and a GNOME client using those widgets. It uses Telepathy and Nokia's Mission Control, and reuses Gossip's UI. The main goal is to permit desktop integration by providing libempathy and libempathy-gtk libraries. libempathy-gtk is a set of powerful widgets that can be embeded into any GNOME application.
[19 users on Ohloh]
KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVIrc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
Eclipse Communication Framework
[17 users on Ohloh]
ECF is a framework for building communications functions into Eclipse-based tools and applications. It can be used to create other plugins, tools, or full applications that require asynchronous point-to-point or publish-and-subscribe messaging.

ECF is also a small set of applications for real-time developer communication, including instant messaging, file sharing, and real-time collaboration.

[15 users on Ohloh]
Supybot is a cross-platform IRC bot written in Python, known to run anywhere Python runs, which includes all *nices, and Windows.

1. Supybot is actively developed.
2. Supybot offers nested commands.
3. Supybot has a powerful and flexible capability system for handling security.
4. Supybot includes many plugins , and has many more ripe for the picking on this very website.
5. Supybot supports multiple servers.

Wee Enhanced Environment for Chat
[12 users on Ohloh]
Tags: chatting internet-relay-chat c++ chat irc client
WeeChat (Wee Enhanced Environment for Chat) is a fast and light IRC client for many operating systems.
Everything can be done with a keyboard, it is customizable and extensible with scripts.
It is compliant with RFC 1459,2810,2811,2812,2813.
[10 users on Ohloh]
Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.
[7 users on Ohloh]
Browser-based web conferencing software.

- Presentation and document sharing
- Audio and video sharing
- Application sharing
- White board and annotations
- Chat
- Polls
- Question manager
- Record and archive

Both open-source and enterprise edition available.

[5 users on Ohloh]
phpMyChat is an easy-to-install, easy-to-use multi-room PHP/DB chat. It is currently available for MySQL, PostgreSQL, and ODBC, and the work on Oracle is in progress. It supports IRC-like commands, moderators, and is available with 37 languages.
[4 users on Ohloh]
Botnix is a highly modular, highly portable IRC bot designed to be connected to multiple networks at any one time. It is lightweight, fast and expandable, written in Perl. Botnix supports SSL, IPv6 and proxies, and is currently in beta stages of development.
smuxi - Smart MUltipleXed Irc
[4 users on Ohloh]
Tags: ncurses linux chat gnome irc client gtk windows swf
Smuxi is an irssi-inspired, flexible, user-friendly and cross-platform IRC client for advanced users, targeting the GNOME desktop.
[3 users on Ohloh]
Java Instant Message (IM) Library, Client and Tools.

Flexible framework to design your own IM client or bots. Supports AIM, ICQ, Yahoo, MSN, Jabber, SMS.

Fully functional GUI with spell checking and a lot more. Includes a web interface for remote/cell access.