KotCity, an open source city simulator
A cross-platform 2D game engine
Children's learning programming language Karel the Robot in 3D
Realtime 3D engine for game development
The Atomic Game Engine is a multi-platform 2D and 3D engine
online 4X browser game engine
3D .NET engine for Windows, Linux, Mac
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
plugin-based RPG manager in C++ and Qt5
Open Game Bootstrap
This is a hacking style game set in the early '80s
Science Fiction, heavy assault, disestablishment of power.
2D physics engine for games
3D Game engine
Chain Reaction is a simple two player game.
Hungry Hero is an open source Flash game built on Starling Framework.
An Open Engine for use on the OUYA
Source code for the Krabat adventure
cross-platform 2d game engine
Complete ROV Control Suite
Cross-platform 2D game engine
Space Exploration Game