Active projects:

Stereo Panorama Converter (shareware)
Stereo Panorama Converter allows you to split and join 360x180 degrees stereographic panorama images

Dragon Draughts (freeware)
Dragon plays 10x10 international draughts at grandmaster level.

Older projects:

Exact backgammon bearoff (freeware)
A computer program that does exact computations in backgammon bearoff positions.

The onager simulator (freeware)
The onager simulator calculates all aspects of a roman onager, such as the projectile acceleration during launch and almost 20 other physical parameters that you may need to design an onager.

The baby onager project
Photo's of a small onager (roman catapult)