Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
The Ren'Py Visual Novel Engine
Voxel game-creation platform with easy modding and game creation
Xash3D FWGS engine
Real Time Strategy game engine supporting early Westwood classics
The game engine for everyone
A game engine powered by python and panda3d
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open game and rendering engine packed into a JavaScript framework
Open-source engine for Heroes of Might and Magic III
Open source voxel game engine with support for survival and crafting
Free, cross-platform 2D game engine powered by Haxe and OpenFL
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Solar2D Game Engine main repository (ex Corona SDK)
Stride (formerly Xenko), a free and open-source cross-platform C# game
A retro game engine for Python
A refreshingly simple data-driven game engine built in Rust
Powerful, mature open-source cross-platform game engine for Python
A modular Common Lisp game engine
Free game engine for development of desktop, mobile, and web games
dhewm 3 main repository
The HTML5 Creation Engine
Open source clone of the Age of Empires II engine
Voxel game engine in C++ with OpenGL