Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Cross-Platform C++ 2D/3D game engine
Cross-platform 2D and 3D game engine with modular architecture
An open source flight dynamics & control software library
A game engine with an emphasis on real-time cutting-edge solutions
Cocos simplifies game creation and distribution with Cocos Creator
Solar2D Game Engine main repository (ex Corona SDK)
GZDoom is a feature centric port for all Doom engine games
UCI chess engine
N64 Game-Engine and Editor using libdragon & tiny3d
Zero Hour running natively on macOS, iPhone & iPad
UZDoom is a feature centric port for all Doom engine games
Recreation of the classic Grand Theft Auto III game executable
Multi Theft Auto is a game engine
Voxel game-creation platform with easy modding and game creation
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Write your game with TypeScript in UE or Unity
Open-source engine for Heroes of Might and Magic III
3D Game engine with editor
fheroes2 is a recreation of Heroes of Might and Magic II game engine
OptiScaler bridges upscaling/frame gen across GPUs
The fastest AI powered Aimbot
Powerful, mature open-source cross-platform game engine for Python