Multi Theft Auto is a game engine
Solar2D Game Engine main repository (ex Corona SDK)
The game engine for everyone
Descent 3 by Outrage Entertainment
3D Game engine with editor
Recreation of the classic Grand Theft Auto III game executable
dhewm 3 main repository
Free game engine for development of desktop, mobile, and web games
3D Procedural Game Engine Using OpenGL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform 2D and 3D game engine
Orx: Data-Driven Game Engine
Vivid3D is a C++ IDE/3D engine, with python scripting.
Modified source engine (2017) developed by valve and leaked in 2020
A free 3D game engine to create games and realtimes scenes for Windows
C++ lightweight cross-platform game engine
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