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[321 users on Ohloh]
Unified OS X instant messaging platform
[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.

[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]
A Jabber/XMPP library written in Tcl.
[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.