A development environment focused on modding
Solar2D Game Engine main repository (ex Corona SDK)
Godot is a powerful cross-platform game engine
The flexible game engine
Open Source real-time strategy game engine for early Westwood games
Fast and lightweight JavaScript game engine built on WebGL and glTF
Injectable LUA scripting system, SDK generator, live property editor
Play Fighting Fantasy fan stories on this simple engine
Entitas is a super fast Entity Component System (ECS) Framework
Cross-Platform C++ 2D/3D game engine
Flax Engine, multi-platform 3D game engine
Simple and light-weight 3D game engine
Simple Beat Saber Mod Installer
A free & open-source 2D sprite editor, made with the Godot Engine
Game engine supporting many 3D/2D formats and graphic effects
Diablo build for modern operating systems
Open source voxel game engine with support for survival and crafting
Sandbox video game with a powerful physics engine
Magic Another Game Engine
An iOS & tvOS Frontend for Multiple Emulators
GemRB is a portable open-source implementation of the Infinity Engine
Multi Theft Auto is a game engine
The game engine for everyone
Open source clone of the Age of Empires II engine