Godot Engine – Multi-platform 2D and 3D game engine

🎮 A list of popular/awesome video games, add-ons, maps, etc. hosted on GitHub. Any genre. Any platform. Any engine.

Cocos2d-x is a suite of open-source, cross-platform, game-development tools used by millions of developers all over the world.

🅰️ web framework for building virtual reality experiences.

a 2D rigid body physics engine for the web ▲● ■

CRYENGINE is a powerful real-time game development platform created by Crytek.

Free (as in freedom) open source clone of the Age of Empires II engine 🚀

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.

An open source re-implementation of Diablo 2

State Management for Turn-Based Games

🎮 📝 A list of Game Development resources to make magic happen.

A retro game engine for Python

One framework for creating powerful cross-platform games.

Data-oriented and data-driven game engine written in Rust

Fast and lightweight WebGL game engine

Minetest, an open source infinite-world block sandbox game engine with support for survival and crafting. Also see https://github.com/minetest/minetest_game

Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

Unity3D Client And C# Server Framework

Egret is a brand new open mobile game and application engine which allows you to quickly build mobile games and apps on Android,iOS and Windows.

Cross-platform 2D and 3D game engine.

a fresh & lightweight javascript game engine

Lightweight and modular C++11/C++14 graphics middleware for games and data visualization

A hand-crafted 2D game library in Go

A minimalist Flutter game engine

Stride Game Engine (formerly Xenko)

A fast, scalable, distributed game server engine/framework for C++, include the actor library, network library, can be used as a real time multiplayer game engine ( MMO RPG/MOBA ), which support C#/Lua script/ Unity3d, Cocos2dx and plan to support Unreal.

Rust library to create a Good Game Easily

The Atomic Game Engine is a multi-platform 2D and 3D engine with a consistent API in C++, C#, JavaScript, and TypeScript

🎮 GDevelop is an open-source, cross-platform game engine designed to be used by everyone.