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
GemRB is a portable open-source implementation of the Infinity Engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open source clone of the Age of Empires II engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Action RPG that's easy to mod
The game engine for everyone
Community effort to maintain and improve Jedi Academy (SP & MP)
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
3D Procedural Game Engine Using OpenGL
lua dev plugin for unreal engine 4 or 5
Urho3D Game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Doom-based AI research platform for reinforcement learning
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL