Solar2D Game Engine main repository (ex Corona SDK)
Injectable LUA scripting system, SDK generator, live property editor
Cross-Platform C++ 2D/3D game engine
Flax Engine, multi-platform 3D game engine
Diablo build for modern operating systems
Multi Theft Auto is a game engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open Source MMORPG Framework
The game engine for everyone
Open source clone of the Age of Empires II engine
3D Procedural Game Engine Using OpenGL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Urho3D Game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
lua dev plugin for unreal engine 4 or 5
A multi core friendly rigid body physics and collision detection lib
Powerful, mature open-source cross-platform game engine for Python
Write your game with TypeScript in UE or Unity
Open-source engine for Heroes of Might and Magic III
Animation Compression Library
Community effort to maintain and improve Jedi Academy (SP & MP)
Doom-based AI research platform for reinforcement learning
GemRB is a portable open-source implementation of the Infinity Engine