Solar2D Game Engine main repository (ex Corona SDK)
A development environment focused on modding
Godot is a powerful cross-platform game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Injectable LUA scripting system, SDK generator, live property editor
The flexible game engine
Entitas is a super fast Entity Component System (ECS) Framework
Open Source real-time strategy game engine for early Westwood games
Cross-Platform C++ 2D/3D game engine
Diablo build for modern operating systems
Simple Beat Saber Mod Installer
Multi Theft Auto is a game engine
GemRB is a portable open-source implementation of the Infinity Engine
Sandbox video game with a powerful physics engine
Open source voxel game engine with support for survival and crafting
fheroes2 is a recreation of Heroes of Might and Magic II game engine
C# application with primary purpose of farming Steam cards
Magic Another Game Engine
Lutris desktop client in Python
An elegant Go board and SGF editor for a more civilized age
Real Time Strategy game engine supporting early Westwood classics
A retro game engine for Python
Open source clone of the Age of Empires II engine
Ct.js is a desktop game engine that makes learning programming fun