Godot is a powerful cross-platform game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cocos simplifies game creation and distribution with Cocos Creator
Flax Engine, multi-platform 3D game engine
An OpenGL RTS game engine written in C
Multi-platform 2D and 3D game engine
Cross-Platform C++ 2D/3D game engine
A game engine with an emphasis on real-time cutting-edge solutions
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Xash3D FWGS engine
The flexible game engine
Solar2D Game Engine main repository (ex Corona SDK)
Cross-platform 2D and 3D game engine with modular architecture
Zig game engine & graphics toolkit
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A complete 3-D game development suite written in Java
GZDoom is a feature centric port for all Doom engine games
Open source voxel game engine with support for survival and crafting
s&box is a modern game engine, built on Valve's Source 2
N64 Game-Engine and Editor using libdragon & tiny3d
LayaAir is an open-source 2D/3D engine
UCI chess engine
The Ren'Py Visual Novel Engine
Recreation of the classic Grand Theft Auto III game executable