mxDateTime
- Date and Time types for Python. [Open Source]
- http://www.egenix.com/files/python/mxDateTime.html

Functions for complex numbers
- Return list of the n n'th roots of a complex number.
- http://www.rcblue.com/Python/croots.py

Multipack Home Page
- Collection of FORTRAN routines interfaced with NumPy. Provides interactive data analysis environment comparative to MATLAB, Octave, Scilab, etc. built on Python.
- http://pylab.sourceforge.net/multipack.html

Mathter
- Cross platform calculator. Able to use paranthesis and can cope with very larger numbers.[OpenSource/GPL]
- http://project5.freezope.org/mathter/index.html/#

Early Math
- Arithmetic practice program for 5-7 year olds.
- http://www.mclough.uklinux.net/EarlyMath.html

MatPy - Matrix package for Python
- Python package for numerical computation and plotting with a MatLab-like interface.
- http://matpy.sourceforge.net/

Fraction.py
- Python code module enhancing the calculation and presentation of fractional calculations.
- http://www.spiritone.com/~english/code/fraction.html

Gary Strangman's Python Modules
- Statistical functions. [Open Source/GPL]
- http://www.nmr.mgh.harvard.edu/Neural_Systems_Group/gary/python.html

Cost Accounting Module
- Python code module containing financial calculation functions for industrial cost analysis.
- http://www.h7.dion.ne.jp/~harm/cost_analysis.py

GMPY
- Provides multiprecision arithmetic functionality to Python programmers. [Open Source, LGPL]
- http://gmpy.sourceforge.net/

SciPy
- Open Source Library of Scientific Tools. SciPy supplements the popular Numeric module, gathering a variety of high level science and engineering modules together as a single package. Within SciPy are modules for graphics and plotting, optimization, integ
- http://www.scipy.org/

R/SPlus
- Python interface to the R system for statistical computing and graphics. [Open Source, BSD-like]
- http://www.omegahat.org/RSPython/index.html

QuantLib
- A free/open-source library for quantitative finance. [Open Source, BSD-like]
- http://quantlib.org/

PyGiNaC
- A Python interface to the C++ library GiNaC (an open framework for symbolic computation within the C++ programming language). [Open Source, LGPL]
- http://cens.ioc.ee/projects/pyginac/

pygsl
- A Python interface for the GNU scientific library. [Open Source, GPL/LGPL]
- http://pygsl.sourceforge.net/