Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
The Ren'Py Visual Novel Engine
Voxel game-creation platform with easy modding and game creation
Real Time Strategy game engine supporting early Westwood classics
A game engine powered by python and panda3d
Multi Theft Auto is a game engine
The game engine for everyone
A modular Common Lisp game engine
LayaAir is an open-source 2D/3D engine
Cocos simplifies game creation and distribution with Cocos Creator
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cross-platform 2D and 3D game engine with modular architecture
Open source clone of the Age of Empires II engine
RPG Maker 2000/2003 and EasyRPG games interpreter
A multi core friendly rigid body physics and collision detection lib
Voxel game engine in C++ with OpenGL
Free game engine for development of desktop, mobile, and web games
A refreshingly simple data-driven game engine built in Rust
Open-source engine for Heroes of Might and Magic III
Powerful, mature open-source cross-platform game engine for Python
Solar2D Game Engine main repository (ex Corona SDK)