A few bits and pieces of software that I have worked on...
FreeSudoku is a GPL-project that seems to have died. I have made a number of enhancements to the program; you can find my version of FreeSudoku here.
Programming in machine languageA not-quite-finished tutorial created for a fellow nerd, who wanted to try programming in machine language: Machine language tutorial.
The AI Game Server
This is a very old project that desperately needs reimplemented in a modern programming language, using XML for data exchange. I haven't found the time to do this. If you are a student, and a talented programmer, this would make an excellent bachelor's project!
AIGS is a server program that allows people to write and test computer players for a variety of common strategy games. You can find more information on the AIGS home page