PyPy. Compiled into JavaScript. JIT-compiling to JavaScript at runtime. Because why not.
This is a very-much-in-flux collection of supporting scripts and infrastructure for an experimental emscripten/asmjs backend for PyPy. You can read more about the project (and try it out live!) here:
http://pypyjs.org/
If you just want to use a pre-compiled PyPy.js interpreter, please download a release bundle from the above website and follow the instructions in the included README.
If you're like to work on the PyPy.js code itself, please see the details in CONTRIBUTING.rst.
For the history of the project, see NEWS.