R & Python
Tips for importing R functionality into Python, and Python functionality into R.
PyPy
PyPy is a replacement for CPython. It is built using the RPython language that was co-developed with it. The main reason to use it instead of CPython is speed: it runs generally faster (see next section).
Intel Python
The Intel Distribution for Python behaves like regular Python, but leverages Intel technologies to speed up many of the core python libraries.