Solar2D Game Engine main repository (ex Corona SDK)
Multi Theft Auto is a game engine
3D Game engine with editor
Flax Engine, multi-platform 3D game engine
3D Procedural Game Engine Using OpenGL
Recreation of the classic Grand Theft Auto III game executable
Free game engine for development of desktop, mobile, and web games
Descent 3 by Outrage Entertainment
dhewm 3 main repository
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Orx: Data-Driven Game Engine
Modified source engine (2017) developed by valve and leaked in 2020
Urho3D Game engine
Mini game engine for games104
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D C++ Game Engine - yet another open source game engine
Improved version of the X-Ray Engine, the game engine
A 2D game engine and level editor
KlayGE is a cross-platform open source game engine
A cross-platform 2D game engine
Game engine for playing tomb raider 1 - 5 levels.
scriptable game engine with built-in support for 2D graphics and sound
The Atomic Game Engine is a multi-platform 2D and 3D engine