A completely free, open-source, 2D game engine
Go bindings for raylib, a simple and easy-to-use library
SDL based generic 2D game engine
General Purpose Engine for Graphic Adventures.
Pure C Game Engine
Chess Database Application
Scriptable frontend for media applications.
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
microQuestMaker64 is a simple adventure creator for the Commodore 64