Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
Voxel game-creation platform with easy modding and game creation
The Ren'Py Visual Novel Engine
Real Time Strategy game engine supporting early Westwood classics
Open source voxel game engine with support for survival and crafting
fheroes2 is a recreation of Heroes of Might and Magic II game engine
A game engine powered by python and panda3d
A complete 3-D game development suite written in Java
The game engine for everyone
Xash3D FWGS engine
Open-source engine for Heroes of Might and Magic III
Fast and lightweight JavaScript game engine built on WebGL and glTF
A refreshingly simple data-driven game engine built in Rust
A retro game engine for Python
Magic Another Game Engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Recreation of the classic Grand Theft Auto III game executable
A game framework written with osu! in mind.
The ioquake3 community effort to continue supporting/developing id's
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
LayaAir is an open-source 2D/3D engine
The HTML5 Creation Engine
Free game engine for development of desktop, mobile, and web games