Awesome Open Source Games

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

Desktop/Android/HTML5/iOS Java game development framework

Cocos2d-x is a suite of open-source, cross-platform, game-development tools utilized by millions of developers across the globe. Its core has evolved to serve as the foundation for Cocos Creator 1.x & 2.x.

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Clone of the Age of Empires II engine 🚀

Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation

Flexible level editor

Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.

Simple and Fast Multimedia Library

A simple Minecraft clone written in C using modern OpenGL (shaders).

OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe

Space exploration, trading, and combat game.

An open source, turn-based strategy game with a high fantasy theme.

OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/

The code base of SuperTuxKart

Classic Tomb Raider open-source engine

Open-source, cross-platform, C++ game engine for creating 2D/3D games.

Game engine

Direct port of the Bullet physics engine to JavaScript using Emscripten

Open source clone of Theme Hospital

A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/

Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+

Drivers and libraries for the Xbox Kinect device on Windows, Linux, and OS X

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

MIT Licensed Open Source version of Torque 3D from GarageGames

SuperTux source code

Descent 3 by Outrage Entertainment

[DEPRECATED] Git mirror of the 0 A.D. SVN source code (migrated to https://gitea.wildfiregames.com on August 20th 2024)

The ioquake3 community effort to continue supporting/developing id's Quake III Arena

A retro multiplayer shooter

A fast and lightweight 2D game physics library.

Community effort to maintain and improve Jedi Academy (SP & MP) + Jedi Outcast (SP only) released by Raven Software

Open-source clone of the original X-Com 👽

[ARCHIVED] Modern reimplementation of the Diablo 1 game engine

The official Allegro 5 git repository. Pull requests welcome!

Advanced rhythm game for Windows, Linux and OS X. Designed for both home and arcade use.

A game of lonely space adventure

Brood War API

A completely free, open-source, 2D game engine built on proven torque technology.

Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱

A free, single-player roguelike dungeon exploration game

An open-source Tomb Raider 1-5 engine remake

Source code of open-source Colobot: Gold Edition project developed by Epsitec and TerranovaTeam

Compatible client of Ace of Spades 0.75

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

Main development repository for Rigs of Rods soft-body physics simulator

Unvanquished is a free and open source FPS/RTS hybrid game powered by the Daemon game engine. Historically based on Tremulous as a continuation with decades of work over it.

Cross-platform port of Arx Fatalis, a first-person role-playing game

Classic overhead run-and-gun game

Source code of KeeperRL