FlexChat

This Web-based chat room server, accessible from almost all Web browsers, has no Java applets, no plug-ins, and no client-side software. It is highly scalable and runs independent of IIS or any other Web server. User features include sending messages via public channels, private channels, or even across rooms, setting online status, making messages visually colorful, and switching among different layout styles. Anti-abuse features include banning certain login names, banning certain users' channels, and denying connection from certain IP addresses or IP ranges. It is able to be integrated into your existing membership system. It features a built-in control panel for easy configuration.