Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A complete 3-D game development suite written in Java
Godot is a powerful cross-platform game engine
An easy to use 2D HTML5 game engine written in TypeScript
Injectable LUA scripting system, SDK generator, live property editor
Multi Theft Auto is a game engine
Open source voxel game engine with support for survival and crafting
Magic Another Game Engine
Real Time Strategy game engine supporting early Westwood classics
Xash3D FWGS engine
The Ren'Py Visual Novel Engine
Open-source engine for Heroes of Might and Magic III
The game engine for everyone
Solar2D Game Engine main repository (ex Corona SDK)
The ioquake3 community effort to continue supporting/developing id's
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A game engine powered by python and panda3d
Voxel game-creation platform with easy modding and game creation
Multi-platform 2D and 3D game engine
Free game engine for development of desktop, mobile, and web games
Fast and lightweight JavaScript game engine built on WebGL and glTF
dhewm 3 main repository
A 2D rigid body physics engine for the web
fheroes2 is a recreation of Heroes of Might and Magic II game engine
A retro game engine for Python