Does anyone know of some really great chat and Message board forums that are very alterable? I am having a hard time finding any, especially any good ones that provides the Admin a lot of control of how the board looks and reacts.

And...

Does anyone know of a JAVA version of a message board or chat room? This way everything would be neatly contained on my site and my job's firewall would not block it.

I appreciate any help you may have to offer,
Daniel Christie