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
Simple and light-weight 3D game engine
Multi Theft Auto is a game engine
Diablo build for modern operating systems
fheroes2 is a recreation of Heroes of Might and Magic II game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open source clone of the Age of Empires II engine
Dust3D is a cross-platform open-source 3D modeling software
Powerful, mature open-source cross-platform game engine for Python
Open-source engine for Heroes of Might and Magic III
3D Procedural Game Engine Using OpenGL
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
RenderDoc is a stand-alone graphics debugging tool
The game engine for everyone
An open source re-implementation of Chris Sawyer's Locomotion
An open source C++ game engine
Open Source Fan-Based EverQuest Emulator Server project
Doom-based AI research platform for reinforcement learning
Write your game with TypeScript in UE or Unity
Animation Compression Library
Urho3D Game engine
Community effort to maintain and improve Jedi Academy (SP & MP)