Well, add one more to the list: ClojureScript.
Rich Hickey introduces ClojureScript
Clojure, a modern dialect of Lisp that runs on the JVM, has been around for a few years, but for some reason we've been hearing more about it in recent months. We did a round-up of learning materials for Clojure here.
ClojureScript was created by Rich Hickey, Clojure core contributors and other including Chris Houser.