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