The source code to VVVVVV
FlightGear Flight Simulator: free open-source multiplatform flight sim
A Endless running game set in desert filled with obstacles
Generate X-Plane 11, 10 and 9 scenarios from OSM data
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
This program is a companion tool for Microsoft game Freelancer
Programming Game, A Practice Tool for Building Intelligent Things