The flexible game engine
Godot is a powerful cross-platform game engine
Solar2D Game Engine main repository (ex Corona SDK)
Fast and lightweight JavaScript game engine built on WebGL and glTF
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
Cross-Platform C++ 2D/3D game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cross-platform 2D and 3D game engine with modular architecture
Xash3D FWGS engine
A game engine with an emphasis on real-time cutting-edge solutions
An OpenGL RTS game engine written in C
Zig game engine & graphics toolkit
Open source voxel game engine with support for survival and crafting
A complete 3-D game development suite written in Java
Game engine supporting many 3D/2D formats and graphic effects
A game engine powered by python and panda3d
Multi Theft Auto is a game engine
LayaAir is an open-source 2D/3D engine
Recreation of the classic Grand Theft Auto III game executable
A Flutter based game engine
A Minecraft mod designed to improve frame rates
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
GemRB is a portable open-source implementation of the Infinity Engine
This is a re-implementation of the 1995 PSX game wipEout