Software I have written

I am a passionate programmer (C++, Python, and Java) and I like to mix mathematics with advanced software and see what happens! Since I get a lot of requests, here's some (free) software you might want to use!

Recent:

Lemur OLAP Library (C++), an experimental library for MOLAP/HOLAP applications. Written with Owen Kaser. Absolutely not meant for the end-users.
COFI: A Java-Based Collaborative Filtering Library, a collaborative filtering library as the name indicate. It is sufficiently mature for production use as we built Racofi Music with it.

Old contributions:

I wanted to use regular expressions to filter RSS feeds the way Stephen Downes does it with RSS_EDU. Hence, I contributed a Python module to jnews.
WebForum is a posting board written in Java. Why write one? When I started it, there was no equivalent as free software. It has been the engine behind ondelette.com for the last 3 years at least.
JNumeric - Numerical Python for Jython
(I'm the current maintainer of this open source project, waiting for a better maintainer to come along.)
JSci - A science API for JavaTM
(An extensive Java library which I contributed to.)
University of Durham, Center for Particle Theory
Some wavelet filters with code in Java.
A C++ class to compute the FWT using the Symmlet8 filter.
The Karhunen-Loève transform in C++.

Generic software links

The Stony Brook Algorithm Repository.

Python - one of the best programming language ever!
http://www.python.org/

Numerical Python
http://sourceforge.net/projects/numpy

Gnuplot
http://www.gnuplot.info/

Gnuplot.py
http://gnuplot-py.sourceforge.net/

Maxima
http://www.gnu.org/software/maxima/

Ninja: Numerically Intensive Java
IBM Research labs
http://www.research.ibm.com/ninja/

JavaNumerics
National Institute of Standards and Technology
http://math.nist.gov/javanumerics/

JavaView
National Institute of Standards and Technology
http://www.javaview.de