Awesome Open Source Games

The HTML5 Creation Engine: Create beautiful digital content with the fastest, most flexible 2D WebGL renderer.

Desktop/Android/HTML5/iOS Java game development framework

rhythm is just a *click* away!

♞ lichess.org: the forever free, adless and open source chess server ♞

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 RollerCoaster Tycoon 2 🎢

Clone of the Age of Empires II engine 🚀

The source code for 2048

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

Flexible level editor

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.

[mirror of https://gitlab.com/veloren/veloren] An open world, open source voxel RPG inspired by Dwarf Fortress and Cube World. This repository is a mirror. Please submit all PRs and issues on our GitLab page.

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

The Ren'Py Visual Novel Engine

Shattered Pixel Dungeon is an open-source traditional roguelike dungeon crawler with randomized levels and enemies, and hundreds of items to collect and use. It's based on the source code of Pixel Dungeon, by Watabou.

Written in C++ and using SDL, The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox, it simulates air pressure and velocity as well as heat.

Game engine

Open source clone of Theme Hospital

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+

Terasology - open source voxel world

Official NetHack Git Repository

SuperTux source code

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

A retro multiplayer shooter

2D HTML5 rendering and layout engine for game development

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 👽

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

A puzzle game inspired by functional programming

A game of lonely space adventure

The Turn Based Strategy Game/eSport. Master your beasts! 🐺

Brood War API

:bird: :video_game: A MelonJS port of the famous Flappy Bird Game

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

A free and open-source Touhou Project fangame

A free, single-player roguelike dungeon exploration game

Unknown Horizons official code repository

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.

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

⚔️ A cross-platform, open source, and super fast MUD client with scripting in Lua

RPG game action-adventure MMO built with Godot and Rust.

Open source RTS game running on the Spring/Recoil engine

DDraceNetwork, a free cooperative platformer game

Stendhal is a fun friendly and free multiplayer online adventure game with an old school feel.