A game engine with an emphasis on real-time cutting-edge solutions
A retro game engine for Python
A pure Go game engine
Godot is a powerful cross-platform game engine
Xash3D FWGS engine
RPG Maker 2000/2003 and EasyRPG games interpreter
The Ren'Py Visual Novel Engine
Open-source engine for Heroes of Might and Magic III
The game engine for everyone
Open source voxel game engine with support for survival and crafting
Real Time Strategy game engine supporting early Westwood classics
A complete 3-D game development suite written in Java
Multi Theft Auto is a game engine
A game engine powered by python and panda3d
Magic Another Game Engine
dhewm 3 main repository
Fast and lightweight JavaScript game engine built on WebGL and glTF
Solar2D Game Engine main repository (ex Corona SDK)
Voxel game-creation platform with easy modding and game creation
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Open source clone of the Age of Empires II engine
Cross-Platform C++ 2D/3D game engine
Voxel game engine in C++ with OpenGL
The HTML5 Creation Engine