PyPy

PyPy is a Python implementation in Python. Yes, it can interpret itself!

Please refer to the PyPy home page for more information about this upcoming Python implementation.

PyPy 1.0 was released on 27/03/2007 http://codespeak.net/pypy/dist/pypy/doc/release-1.0.0.html

It includes a JIT compiler, stackless-like functionality, uses the Boehm garbage collector and has whole lot of "backends" - C, LLVM, JavaScript, CLI, Java.