A high performance professional chat server software designed for chat community building, moderated chat events, or online live support. The user interface is multilingual, and skinnable. SSL and firewall compatible, 12Planet Chat Server runs on Windows 95/98/2000/NT, Linux, Solaris, and more. Version 2.5 delivers web administration interface.
More info:
hxxp://www.12planet.com/en/software/chat/pricing.html