Most people are aware, if only vaguely, of the big Four Python implementations:
CPython, or just Python, the reference implementation written in C. IronPython, written in .NET. Jython, written in Java. PyPy, the optimizing implementation written in Python (actually, it's written in a subset of Python, RPython). But the Python ecosystem is a lot bigger than just those four. Here are just a few other implementations that you might be interested in: Stackless - the "forgetten Python", Stackless is, I believe, the oldest implementation behind only CPython itself. It's a fork of CPython with the calling stack removed and fast and lightweight microthreads, and is used extensively in EVE Online. http://www.stackless.com/ Nuitka - optimising Python compiler written in C++, supports Python 2.6 and 2.7, claims to be up to twice as fast as CPython. http://nuitka.net/pages/overview.html WPython - another optimizing version of Python with wordcodes instead of bytecodes. http://code.google.com/p/wpython/ CLPython, an implementation of Python written in Common Lisp. http://common-lisp.net/project/clpython/ CapPython is an experimental restricted version of Python with capabilities. http://plash.beasts.org/wiki/CapPython http://en.wikipedia.org/wiki/Object-capability_model Berp - a compiler which works by translating Python to Haskell and compiling that. https://github.com/bjpop/berp/wiki Give them some love! -- Steven -- http://mail.python.org/mailman/listinfo/python-list
