Multi Theft Auto is a game engine
Solar2D Game Engine main repository (ex Corona SDK)
fheroes2 is a recreation of Heroes of Might and Magic II game engine
The game engine for everyone
Powerful, mature open-source cross-platform game engine for Python
Injectable LUA scripting system, SDK generator, live property editor
The flexible game engine
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Open source clone of the Age of Empires II engine
dhewm 3 main repository
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Cross-Platform C++ 2D/3D game engine
RPG Maker 2000/2003 and EasyRPG games interpreter
Flax Engine, multi-platform 3D game engine
2D game development library for Ruby and C++
Open-source engine for Heroes of Might and Magic III
3D Procedural Game Engine Using OpenGL
Open Source real-time strategy game engine for early Westwood games
A multi core friendly rigid body physics and collision detection lib
Urho3D Game engine
A simple math library for games and computer graphics
3D game engine/framework in C, with Luajit and Python bindings now
A pure Go game engine
Svelto ECS C# Entity Component System
scene-oriented, flexible 3D engine (C++, Python, C#, Java)