A universal instant messaging (IM) program
Development toolkit for Web Services and XML data bindings for C & C++
PHP driven chat forum
Standalone chat system developed in php, mysql and javascript
Low-latency, high quality voice chat for gamers
Simple open source php based HTML5 rich web chat system
Darkbot is an AI robot for IRC, especially useful for help channels.
PinoyChat: The International Chatroom App for Desktop
CRG is now on GITHUB and Facebook
free chat system
Simple Command Line XMPP message sender
A secure implementation of GWT Client / Support Agent chat