The Tiny JavaScript Game Engine That Can!
RTSish Game Engine
An isometric arcade-style game of skill, puzzles and exploration
Animation Compression Library
Open source reimplementation of GTA San Andreas game engine in Unity
a UCI chess engine
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
A cross platform Lua based game engine
An Adventure Game Engine
A basic 3D environment with a first-person POV