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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.

[321 users on Ohloh]
Unified OS X instant messaging platform
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 ...
[86 users on Ohloh]
Miranda is the next generation Miranda IM client for Windows.
[20 users on Ohloh]
Alvaro's Messenger is a Tcl/Tk client for MSN Messenger. Its features include multi-language support, smileys, docking support for KDE 3 and GNOME 2 (FreeDesktop compatibility), logging, profiles support, email notification, customizable sounds, group management, file transfers with NAT support, and proxy support. Some special features include the possibility of knowing who has deleted you from his/her list, connecting "silently" (appearing invisible), and so on.
[9 users on Ohloh]
CenterIM is a fork of CenterICQ, an ncurses-based IM client. It supports ICQ, MSN, AIM, Yahoo, Gadu-Gadu, Live Journal, IRC, RSS and Jabber protocols
[6 users on Ohloh]
Galaxium is an instant messenger application designed for the GNOME desktop. It will allow you to connect to MSN (and other protocols through the use of addins) to communicate with your family, friends and co-workers! It is a cross-platform application that uses the Mono and GTK# toolkits for the user interface and protocol handlers. Several plugins are also in the works to bring advanced features like Adium Theme support.
[5 users on Ohloh]
shaim is an open-source multi-protocol instant messaging client written in C#.
[3 users on Ohloh]
Ayttm is an open source, multi-protocol instant messenger. It is built using C and Gtk-2 and works across multiple platforms.
[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.

[1 users on Ohloh]
JMeeting is a next generation type of business or personal meeting. JMeeting will have audio, video and chat conferencing easily set up and viewable. JMeeting will be able to share and create presentations. During the meeting you can click present and it will present the presentation or document full screen to all users with a red laser to show important points.
[1 users on Ohloh]
Orion is an multi-language multi-protocol Library mostly covering Chat Protocols. At the moment IRC (ruby) is fully supported. MSN (ruby) is partly.
[0 users on Ohloh]
Funpidgin is a fork of the popular open source client Pidgin which allows instant messaging with over twenty different protocols.