So something like Clojure, but that runs on the CLR and Javascript as well?

CLR - https://github.com/richhickey/clojure-clr JS - https://github.com/clojure/clojurescript Python - https://github.com/halgari/clojure-py Lua - https://github.com/raph-amiard/clojurescript-lua C - https://github.com/schani/clojurec

(Sorry, couldn't resist.)