Multi Theft Auto is a game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
The ioquake3 community effort to continue supporting/developing id's
A multi core friendly rigid body physics and collision detection lib
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Flax Engine, multi-platform 3D game engine
Kotlin extensions for the libGDX game framework
3D and 2D game engine written in Rust
LayaAir is an open-source 2D/3D engine
The HTML5 Creation Engine
A modular Common Lisp game engine
The game engine for everyone
Multi-platform 2D and 3D game engine
The Tiny JavaScript Game Engine That Can!
Voxel game engine in C++ with OpenGL
dhewm 3 main repository
Cross-platform 2D and 3D game engine with modular architecture
A Flutter based game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Free game engine for development of desktop, mobile, and web games
Open source clone of the Age of Empires II engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Magic Another Game Engine
A refreshingly simple data-driven game engine built in Rust
Stride (formerly Xenko), a free and open-source cross-platform C# game