Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
Real Time Strategy game engine supporting early Westwood classics
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open source voxel game engine with support for survival and crafting
Injectable LUA scripting system, SDK generator, live property editor
Cross-Platform C++ 2D/3D game engine
dhewm 3 main repository
Open source clone of the Age of Empires II engine
The Tiny JavaScript Game Engine That Can!
2D game development library for Ruby and C++
Magic Another Game Engine
Solar2D Game Engine main repository (ex Corona SDK)
The game engine for everyone
Ct.js is a desktop game engine that makes learning programming fun
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A Flutter based game engine
Open-source engine for Heroes of Might and Magic III
Open Source real-time strategy game engine for early Westwood games
LayaAir is an open-source 2D/3D engine
3D Procedural Game Engine Using OpenGL
The flexible game engine
Urho3D Game engine
A retro game engine for Python