BuddyPress.org

That’s right, Mike.

David Aubin’s port of BlueImp’s AJAX Chat to BP has group functionality:

https://wordpress.org/extend/plugins/buddypress-ajax-chat/

The original chat interface isn’t polished enough though and the actual port by Dave has its bugs.

I currently have a v1.2 “re-port” of BlueImp’s AJAX Chat working on my test server. It functions well, but outputs quite a few warnings and notices in the server log! If I can get it to a stable state without the warnings, I might release it.

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If there’s a better, open-source chat plugin that supports multiple rooms, that would be another option!