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
A retro game engine for Python
Multi Theft Auto is a game engine
The ioquake3 community effort to continue supporting/developing id's
fheroes2 is a recreation of Heroes of Might and Magic II game engine
LayaAir is an open-source 2D/3D engine
A game engine powered by python and panda3d
Voxel game-creation platform with easy modding and game creation
Real Time Strategy game engine supporting early Westwood classics
Solar2D Game Engine main repository (ex Corona SDK)
The game engine for everyone
Multi-platform 2D and 3D game engine
Free game engine for development of desktop, mobile, and web games
Fast and lightweight JavaScript game engine built on WebGL and glTF
A complete 3-D game development suite written in Java
Magic Another Game Engine
Stride (formerly Xenko), a free and open-source cross-platform C# game
A quick and easy to use drag and drop retro game creator
Open source voxel game engine with support for survival and crafting
dhewm 3 main repository
Xash3D FWGS engine
Open-source engine for Heroes of Might and Magic III
A refreshingly simple data-driven game engine built in Rust