Godot is a powerful cross-platform game engine
Real Time Strategy game engine supporting early Westwood classics
Xash3D FWGS engine
Voxel game-creation platform with easy modding and game creation
The game engine for everyone
Open source voxel game engine with support for survival and crafting
The Ren'Py Visual Novel Engine
LayaAir is an open-source 2D/3D engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
A game engine powered by python and panda3d
A modular Common Lisp game engine
Free game engine for development of desktop, mobile, and web games
Multi Theft Auto is a game engine
Open-source engine for Heroes of Might and Magic III
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open source clone of the Age of Empires II engine
Voxel game engine in C++ with OpenGL
A retro game engine for Python
A refreshingly simple data-driven game engine built in Rust
A multi core friendly rigid body physics and collision detection lib
Stride (formerly Xenko), a free and open-source cross-platform C# game
A complete 3-D game development suite written in Java
The HTML5 Creation Engine
Cross-platform 2D game engine focused on ultimate productivity
An easy to use 2D HTML5 game engine written in TypeScript