Free game engine for development of desktop, mobile, and web games
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Cocos simplifies game creation and distribution with Cocos Creator
3D Game engine with editor
Cross-platform 2D and 3D game engine with modular architecture
3D game engine with lua scripting
Desktop/Android/HTML5/iOS Java game development framework
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Flexible level editor
Doom-based AI research platform for reinforcement learning
Vivid3D is a C++ IDE/3D engine, with python scripting.
3D racing game with Sci-Fi elements and Track Editor
MIT Licensed Open Source version of Torque3D from GarageGames
OpenGL port of the classic 6dof 3D shooter Descent
3D C++ Game Engine - yet another open source game engine
A 2D game engine and level editor
Lego Island 2 Game Editor
RelaxChess, chess game that makes no search futher needed for a wow
A traditional top-down OpenGL car racing game
Your death sentence awaits...