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
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Vivid3D is a C++ IDE/3D engine, with python scripting.
MIT Licensed Open Source version of Torque3D from GarageGames
3D C++ Game Engine - yet another open source game engine
A 2D game engine and level editor
3D Game engine
Zen3D is a 3D engine and editor for creating games