The flexible game engine
Godot is a powerful cross-platform game engine
Solar2D Game Engine main repository (ex Corona SDK)
Cocos simplifies game creation and distribution with Cocos Creator
Flax Engine, multi-platform 3D game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cross-platform 2D and 3D game engine with modular architecture
Multi-platform 2D and 3D game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cross-Platform C++ 2D/3D game 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
Xash3D FWGS engine
Game engine supporting many 3D/2D formats and graphic effects
Open source voxel game engine with support for survival and crafting
A complete 3-D game development suite written in Java
Multi Theft Auto is a game engine
A game engine powered by python and panda3d
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
N64 Game-Engine and Editor using libdragon & tiny3d
This is a re-implementation of the 1995 PSX game wipEout
A modular Common Lisp game engine
LayaAir is an open-source 2D/3D engine
A Minecraft mod designed to improve frame rates