Actively maintained
Trelby - A program for writing movie screenplays. The product of my now-defunct company. Lives on as an open source project with me as the lead developer.
Sporadically maintained
Gfract - A multi-threaded fractal exploration program.
Unmaintained
cwall - A program to keep track of which routes at indoor climbing gyms one has climbed.
cd-console - Text-mode CD player program for Linux/FreeBSD.
Gothello - Othello with a somewhat decent computer AI.
One-off hacks
pathfinder - A* path-finding algorithm implementation in Java
flip-level - Flips Unreal Tournament levels upside down.
ja2_rip - Rips the wav files out of the game Jagged Alliance 2.