A universal instant messaging (IM) program
Development toolkit for Web Services and XML data bindings for C & C++
VICIdial Contact Center Suite
Psi IM — Qt-based XMPP client
Low-latency, high quality voice chat for gamers
MSN compatible messenger application
Facebook Messenger Power PC App
PinoyChat: The International Chatroom App for Desktop
Moved to http://www.fuzzball.org
A Work-In-Progress, Full-Featured, Open Source IRC Client
'Leet Network is a free chatting client Based on java technologies.
The IRC's Talking Robot
The original Xivio.com World Server Core