It supports these languages: Python, Python3, R, JavaScript, SQL, C++, Scala/Spark, Lua/Torch, Java, Julia, Groovy, Node, Ruby, HTML, and Clojure.
It has an experimental native version: https://github.com/twosigma/beaker-notebook/wiki/Electron-Be...
Talk at SciPy 2015: https://www.youtube.com/watch?v=iMPfLz6kKv8