Shtuff Chat - Free Group / Team chat with persistent history.
Waver - Description: Google Wave is a great way to communicate and collaborate. Waver lets you:
Meet in Chat - Meet new people. Have fun sharing photos.
Rizzoma - Email and IM are linear contextless communication tools.
Kandan - Open Source private chat server. Your own private Chat server in minutes, plus additional features.
BSI Knowledge Manager - Central document management & knowledge base