A universal instant messaging (IM) program
Development toolkit for Web Services and XML data bindings for C & C++
Low-latency, high quality voice chat for gamers
MSN compatible messenger application
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
Secure chat and conferencing protocol
Network text chat (instant message) app requiring zero configuration
A modern, minimalist, extensible chat bot.
GlowMuck is a multi-user text-based role-play platform, a MUD server.