Free game engine for development of desktop, mobile, and web games
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Orx: Portable Game Engine
A 2D game engine and level editor
KlayGE is a cross-platform open source game engine
A cross-platform 2D game engine
scriptable game engine with built-in support for 2D graphics and sound
The Atomic Game Engine is a multi-platform 2D and 3D engine
A generic 2D engine for any kind of game
2D physics engine for games
Tactical, turn-based game engine, that uses OpenGL and WinAPI
Open source, moddable game engine for the "Polygon Love 2" game
cross-platform 2d game engine
Cross-platform 2D game engine