[rjbwork]

HuBot and mmBot (a C#/.NET port) has an adapter for hipchat

[NicoJuicy]

And for Jabbr, which is a Jabber implementation on Signalr (a realtime thingy of .Net).

It's actually pretty neat, you can try it out on : https://jabbr.net (+ it's opensource if you want to implement your own team chat )