Any good team-chat websites?

Question

Are there any good team-chat websites, preferably in Python, ideally with CherryPy or Trac?

This is similar to http://stackoverflow.com/questions/46612/whats-a-good-freeware-collaborative-ie-multiuser-instant-messenger#46660, but a few primary differences:

1) I very much want to host the server.

2) I don't care if Smileys are included or not in the client.

3) I'd like two options for the users:
a) Ability to host a private IRC like chat on my Trac page (or link to such a page),
b) allow remote clients to also interact.

Answer 1

Campfire from 37 signals - the rails guys.

Edit: It doesn't meet your requirements but it has some great features...