Free game engine for development of desktop, mobile, and web games
3D Game engine with editor
Cocos simplifies game creation and distribution with Cocos Creator
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Descent 3 by Outrage Entertainment
Cross-platform 2D and 3D game engine with modular architecture
3D game engine with lua scripting
Injectable LUA scripting system, SDK generator, live property editor
MIT Licensed Open Source version of Torque3D from GarageGames
3D C++ Game Engine - yet another open source game engine
2D Game Engine
2D Game Engine with Lua Scripting made on top of SFML
Multi-platform game engine similar to old Megaman with a stage editor
A Simple Game Engine
A retro style video game engine for RPGs and adventure games.
cross-platform 2d game engine
Zen3D is a 3D engine and editor for creating games