BlaB! Lite (free) a Fully resizable AJAX based and best viewed with any browser chat system, translated in 18 languages - completely free!
BlaB 5 is a PHP/AJAX based and best viewed with any browser multi-room web chat that supports PHP4/PHP5/PHP6 and MySQL, SQLite & PostgreSQL databases.
BlaB 5 also supports 'guest' login, has its own user registration system and can be integrated into various bulletin boards and CMS such as phpBB, IP.Board, vBulletin, Expression Engine, Joomla, Simple Machines and we add boards & CMS to integrate BlaB! with, on request.