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[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 ...
[36 users on Ohloh]
A chat network to IRC gateway. Currently supports Jabber, MSN, OSCAR (AIM/ICQ) and Yahoo protocols.
[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
[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.

[3 users on Ohloh]
joscar is an easy-to-use, robust library for connecting to AOL Instant Messenger from Java.

With joscar, your users can send and receive messages (including image & secure messages), transfer files, and join chat rooms. A powerful event model allows for tight integration with a graphical or Ajax interface, to provide a cool user experience.

[0 users on Ohloh]
pyOSCAR is a python implementation of the official OSCAR protocol. pyOSCAR speaks to the AIM backend using the same protocol that official native AOL clients use.

See OSCAR protocol specification at http://dev.aol.com/aim/oscar/