Shedskin - An experimental (restricted-Python)-to-C++ compiler
code.google.com
code.google.com
I found out about the ShedSkin project in a comment of the PyPy.js announcement (https://news.ycombinator.com/item?id=6090041), where someone got ShedSkin ported to Emscripten (https://github.com/lukestanley/emscripten_shedskin_setup/).