Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Godot is a powerful cross-platform game engine
The Ren'Py Visual Novel Engine
Multi Theft Auto is a game engine
Open game and rendering engine packed into a JavaScript framework
Multi-platform 2D and 3D game engine
Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
Real Time Strategy game engine supporting early Westwood classics
Voxel game-creation platform with easy modding and game creation
A game engine powered by python and panda3d
A retro game engine for Python
A complete 3-D game development suite written in Java
The game engine for everyone
Solar2D Game Engine main repository (ex Corona SDK)
Open-source engine for Heroes of Might and Magic III
fheroes2 is a recreation of Heroes of Might and Magic II game engine
A game engine with an emphasis on real-time cutting-edge solutions
Fast and lightweight JavaScript game engine built on WebGL and glTF
Free game engine for development of desktop, mobile, and web games
A refreshingly simple data-driven game engine built in Rust
LayaAir is an open-source 2D/3D engine
The HTML5 Creation Engine
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
The flexible game engine