"The Lispbot is pretty much what it sounds like. It is an IRC bot written in Common Lisp. It doesn't do things like OPing and kicking flooder, other bots do that just fine. Rather, it provides some structure for other applications that users might want to interact with over IRC. Main feature is "eval" which allows commands to be used in a channel and executed in the main lisp system with the output going back to the channel."
"A flexible and extendable Internet Relay Chat bot written in Common Lisp. It has been developed using Franz' Allegro Common Lisp and CMU Common Lisp, but should be fairly easy to port to any Common Lisp that supports network connections and threads."