Pidgin

http://www.imblaze.com/

An obvious gaim ripoff, featuring the look of gaim, the protocols of gaim, and a new feature - "a small non-obtrusive {sic} ad [that] will roll up into the window as all of your messages do."

I do not believe that the source code of this scam/spyware/whatever has been released - in fact, I'm relatively sure of it. Their support forum even admits that it is an illegal ripoff.