BlaB! Lite (freeware)

Fully resizable AJAX based and best viewed with any browser chat system, translated in 10 languages - completely free! BlaB!

AJAX based, extremely fast multiroom chat. Integration with popular PHP scripts such as IP.Board, phpBB, vBulletin, Exp.Engine, SMF, WBB, Joomla. BlaB! IM (freeware)

Instant messaging system that allows all the visitors of a website to chat to each other in a way very similar to other popular instant messengers. BlaB! IM Pro

Chatbox and Instant Messenger that can be fully integrated into Invision Board, phpBB, vBulletin, Exp.Engine, Social Engine, Joomla, SMF, WBB. Tick-It

All-in-one online helpdesk system written in PHP. Tick-It supports PHP4/PHP5 and MySQL, SQLite, PostgreSQL databases.