Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Voxel game-creation platform with easy modding and game creation
Multi Theft Auto is a game engine
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
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open-source engine for Heroes of Might and Magic III
The game engine for everyone
A game engine powered by python and panda3d
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A complete 3-D game development suite written in Java
A retro game engine for Python
The flexible game engine
dhewm 3 main repository
Magic Another Game Engine
Free game engine for development of desktop, mobile, and web games
A refreshingly simple data-driven game engine built in Rust
A game framework written with osu! in mind.
The ioquake3 community effort to continue supporting/developing id's
The HTML5 Creation Engine
A modular Common Lisp game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)