9 links
Fraction.py
spiritone.com
Python code module enhancing the calculation and presentation of fractional calculations.
MatPy - Matrix package for Python
matpy.sourceforge.net
Python package for numerical computation and plotting with a MatLab-like interface.
Multipack Home Page
pylab.sourceforge.net
Collection of FORTRAN routines interfaced with NumPy. Provides interactive data analysis environment comparative to MATLAB, Octave, Scilab, etc. built on Python.
Python Chess Module
alcyone.com
A Python module which understands the rules of chess and can adjudicate a game, verifying if moves are correct. [Open Source, GPL]