full-blown GTA 3 -SA clone. Done in Game Maker. No missions though
A visual editing environment for Sims3 JAZZ resources.
SuperWikia: The Runtime/Realtime Environment for Codesmiths
Park Managing tool for Roller Coaster Tycoon 3 (RCT3)
remake of the classic STUNTS game, but more realistic; more like GTA 3
Tool for Wide Area Measurement System
Game of Geometry, Structure, and Physics
Windows remake of Geoff Crammond's Stunt Car Racer
X-Plane plugin which controls the Saitek Instrument Panel
Parser to bring OSM (Open Street Map) data into Unity