Quote
Python. Client side.
Skulpt is an entirely in-browser implementation of Python.
No preprocessing, plugins, or server-side support required, just write Python and reload.
Demo
The code is run entirely in your browser, so don't feel obligated to "crash the server", you'll only stub your toe. Help, or examples: 1 2 3 4 5 6 7 8. Ctrl-Enter to run.
Sexy Sauce: http://www.skulpt.org
GIT Sauce: https://github.com/skulpt/