Eliza-clj is a project mainly written in Clojure, it's free.
Collaborative ELIZA (in clojure) -- a chatbot anyone can edit
The homage to the original ELIZA http://en.wikipedia.org/wiki/ELIZA , 50+ years later. Written in clojure, a modern dialect of LISP, also 50+ years later.
Launch its compojure web server somewhere. i hear google app engine works. a modern twist is that the response rules are crowdsourced.
Copyright (C) 2011 FIXME
Distributed under the Eclipse Public License, the same as Clojure.