Web based software
Middle Name Guesser - An attempt to guess your middle name based on your first and last names. This should learn from it's mistakes and get better at guessing as it does.
Sudoku - My version of the game of Sudoku. Not a full featured program yet but it solves Sudoku boards and you can play a game yourself if you want.
Killer - This is just a copy of the Sudoku game that has been modified to store and display Killer boards. It still tries to solve the puzzle as if it were Sudoku which means that what squares it solves are valid but you need to have solved most of the board before it can get started.
Open source projects
PHP - I have plans to add some code to contribute to PHP. Specifically in the LDAP section.
OpenVAS - OpenVAS is the GPL fork of Nessus ever since Tenable closed the project. OpenVAS (and Nessus before it) is not a silver bullet but it is still an indespensible tool.
w3af - w3af is website vulnerabiility scanner written in Python.
Texturize Gimp plugin - Texturize is a Gimp plugin that generates large textures from small samples. It can also generate tileable textures. I compiled the Mac OS X PPC version of this plugin.