davazp/jscl · GitHub. Wow, impressive. A Common Lisp that runs as a REPL in the browser. What's exciting about it is how complete it is - after a (defun anton (a b) (+ a b)) I directly did a (disassemble #'anton) without any problems and it gave me the generated JavaScript code. Other constructs from the CL world also work smoothly. Definitely worth keeping an eye on, could become exciting (e.g. a JSCL on Node.js?).