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Open Source Games

Open‑source projects that are complete video games offering multiplayer, role‑playing, or simulation experiences. This collection is ideal for community‐driven game codebases where the game logic is available for modification and experimentation.

68 projects

108,394 contributors

$2.2B

Most contributors

Cataclysm

Cataclysm is a post-apocalyptic survival roguelike game where players must navigate a world devastated by various catastrophes. The game features turn-based gameplay, crafting systems, character development, and procedurally generated worlds filled with zombies and other threats.

8,184

298

$103M

osu!

osu! is a free-to-play rhythm game where players click, drag, and spin to the beat of music. Players follow hit circles and other elements that appear on screen in time with the song, aiming for high scores and accuracy.

6,978

730

$16M

/tg/station

A multiplayer space station simulation game built on BYOND where players take on various roles aboard a space station, featuring complex systems for atmospherics, medical, engineering, and security gameplay with a mix of roleplaying and emergent chaos

6,746

172

$47M

Space Station 14

Space Station 14 is a multiplayer online game that reimagines Space Station 13, featuring a space station simulation where players take on various roles to maintain the station, conduct research, and handle emergencies. The game is built using the Robust Toolbox engine and emphasizes roleplaying elements in a sci-fi setting.

4,733

193

$143M

Mindustry

Mindustry is an open-source sandbox tower defense game with factory-building elements. Players gather resources, build intricate production chains, defend against waves of enemies, and manage logistics across various maps. The game features both single-player and multiplayer modes, with extensive modding support and cross-platform compatibility.

4,460

357

$8.4M

Lichess

Lichess is a free, open-source chess platform that provides online chess gameplay, tournaments, training resources, and social features for players of all skill levels. The platform emphasizes accessibility, performance, and a clean user experience without advertisements.

3,805

514

$11M

OpenRCT2

OpenRCT2 is an open-source re-implementation of RollerCoaster Tycoon 2, a theme park management and construction simulation game. It extends the original game with new features, multiplayer functionality, user interface improvements, and platform compatibility across Windows, macOS, and Linux.

3,602

376

$36M

Paradise Station

Paradise Station is a Space Station 13 game server and codebase, providing a multiplayer roleplaying experience set on a space station. It is a fork of the /tg/station codebase with unique features and modifications for its community.

3,061

86

$25M

XMage

XMage is an open-source implementation of Magic: The Gathering that allows players to play the card game online, featuring both single-player and multiplayer modes, with support for various game formats and rules enforcement

2,985

135

$84M

Friday Night Funkin'

A rhythm game made with HaxeFlixel

2,832

166

$2.9M

Delta-V

Delta-V is a Space Station 14 fork focused on creating a unique space station simulation experience with custom content and gameplay mechanics

2,823

89

$249M

Frontier Station 14

Frontier Station 14 appears to be a Space Station 14 fork/variant focused on roleplaying gameplay in a space station environment

2,671

81

$198M

BeeStation 13

BeeStation 13 is a multiplayer space station simulation game based on the Space Station 13 codebase. It is a fork of the /tg/station codebase that focuses on providing a unique gameplay experience with custom features and modifications while maintaining the core SS13 mechanics of roleplaying various crew members aboard a space station.

2,628

66

$33M

Cataclysm: Bright Nights

Cataclysm: Bright Nights is a post-apocalyptic survival roguelike game, forked from Cataclysm: Dark Days Ahead. Players must survive in a world devastated by various catastrophes while managing resources, crafting items, and dealing with monsters and other threats.

2,541

64

$60M

Unciv

Open-source Android/Desktop remake of Civ V

2,541

142

$16M

OpenRA

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.

2,523

307

$21M

CodeCombat

CodeCombat is an educational platform that teaches programming through a game-based learning experience where players write code to control characters and solve challenges in a fantasy coding adventure game

2,330

270

$21M

Endless Sky

Space exploration, trading, and combat game.

2,171

204

$12M

Baystation

Baystation's flavor of Space Station 13

2,117

84

$18M

Shiptest

Shiptest is a Space Station 13 game variant/fork focused on spaceship-based gameplay, where players operate vessels and engage in space exploration and combat scenarios

1,951

43

$28M

Luanti

Minetest is an open-source voxel game engine and game, similar to Minecraft, that allows players to build and explore procedurally generated 3D worlds. It features multiplayer support, modding capabilities through Lua API, and a client/server architecture.

1,937

169

$12M

Pokémon Showdown

Pokémon battle simulator.

1,785

125

$46M

PokéRogue

A browser based Pokémon fangame heavily inspired by the roguelite genre.

1,690

76

$10M

TerraGov Marine Corps

TGMC: TerraGov Marine Corps, a SS13 mod

1,671

44

$20M

Dungeon Crawl Stone Soup

Dungeon Crawl Stone Soup is a free and open-source roguelike game where players explore procedurally generated dungeons, battle monsters, and collect treasures. The game features turn-based tactical combat, character development with multiple species and backgrounds, and permanent death mechanics.

1,595

133

$23M

Netrunner

Jinteki.net is a Linux Foundation project providing an open-source platform for digital collaboration, focusing on secure, efficient information sharing and community-driven development within the open-source ecosystem.

1,550

99

$5.3M

CM-SS13

Contains the code for CM-SS13

1,543

19

$24M

VOREStation

The codebase used by the VORE SS13 server, based on Polaris SS13.

1,513

22

$35M

OpenTTD

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

1,509

192

$24M

Goonstation

Repository for the Goonstation branch of SS13

1,493

45

$32M

Stockfish

A free and strong UCI chess engine

1,441

145

$608K

SuperTuxKart

The code base of supertuxkart

1,408

262

$31M

Tau Ceti Classic

Tau Ceti Classic is a Space Station 13 game codebase, which is a multiplayer online role-playing game set on a space station. It appears to be a fork or variant of the SS13 game focused on the Tau Ceti community.

1,319

18

$17M

Thrive

The main repository for the development of the evolution game Thrive.

1,304

61

$19M

The Battle for Wesnoth

The Battle for Wesnoth is an open-source turn-based strategy game with a fantasy theme. Players build armies, manage resources, and engage in tactical combat across hex-based maps in both single-player campaigns and multiplayer matches. The game features multiple factions with distinct units and abilities, set in a rich fantasy world with detailed lore.

1,255

126

$14M

Beyond All Reason

Main game repository for Beyond All Reason.

1,142

108

$23M

Sunflower Land

Sunflower Land is an open-source blockchain-based farming simulation game under The Linux Foundation, where players can cultivate virtual land, grow crops, and trade resources in a decentralized ecosystem.

1,046

40

$17M

DDraceNetwork

DDraceNetwork (DDNet) is an open-source modification of Teeworlds, a retro multiplayer platform game. It transforms the original game into a cooperative racing game where players work together to complete challenging levels featuring unique gameplay mechanics like freeze, deep freeze, and teleporters.

935

100

$14M

Pioneer Space Simulator

A game of lonely space adventure

913

82

$33M

SuperTux

SuperTux source code

861

142

$3.9M

Unitystation

The original unitystation

801

44

$325M

Warzone 2100

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+

786

92

$31M

Aurorastation

Aurora.3 is a Space Station 13 codebase and game server project based on Baystation12, featuring a science fiction roleplaying environment where players take on various roles aboard a space station. The project includes custom features, maps, and gameplay mechanics for the SS13 community.

777

30

$27M

fheroes2

fheroes2 is a recreation of Heroes of Might and Magic II game engine.

747

82

$6M

MekHQ

MegaMek is a networked Java clone of BattleTech, a turn-based sci-fi boardgame for 2+ players. Fight using giant robots, tanks, and/or infantry on a hex-based map.

729

19

$14M

Ancient Beast

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

613

53

$1M

FinalBurn Neo

FinalBurn Neo (FBNeo) is an arcade system emulator that supports various gaming platforms and arcade systems. It is a continuation of the FinalBurn emulator series, focusing on accuracy and compatibility while providing features for playing classic arcade games.

546

26

$69M

Second Life Viewer

Second Life Viewer is the official client application for accessing Second Life, a 3D virtual world platform. It allows users to explore the virtual environment, interact with other users, create and trade virtual items, and participate in the Second Life economy.

472

22

$50M

Unvanquished

An FPS/RTS hybrid game powered by the Daemon engine (a combination of ioq3 and XreaL)

464

69

$3.5M

Widelands

Widelands is a free, open source real-time strategy game with singleplayer campaigns and a multiplayer mode. The game was inspired by Settlers II™ (© Bluebyte) but has significantly more variety and depth to it.

438

55

$13M

NetHack

Official NetHack Git Repository

425

80

$15M

ET: Legacy

ET: Legacy is an open source project based on the code of Wolfenstein: Enemy Territory which was released in 2010 under the terms of the GPLv3 license.

393

62

$16M

Angband

A free, single-player roguelike dungeon exploration game

372

41

$10M

FreeSpace2 Source Code Project

FreeSpace2 Source Code Project (FSO) is an open-source game engine project that maintains and enhances the source code of the FreeSpace 2 space combat simulation game. It adds modern features, fixes bugs, and enables the game to run on contemporary systems while supporting community-created content and modifications.

360

26

$32M

Exult

Exult is a project to recreate Ultima 7 for modern operating systems, using the game's original plot, data, and graphics files.

229

25

$10M

PyChess Variants

Chess variant server

205

22

$10M

Nine Chronicles

Unity client application for Nine Chronicles, a fully decentralized idle RPG powered by the community.

158

13

$14M

Hengband

変愚蛮怒のメインリポジトリ

143

4

$18M

VASSAL

VASSAL is an open-source engine for building and playing online adaptations of board games and card games. It allows users to create digital versions of board games and play them over the internet or via email. The platform supports both real-time and play-by-email gameplay, custom game piece design, and dice rolling simulation.

124

10

$8.2M

Minokawa

A project focused on developing a Filipino-themed game using the Unity game engine, featuring a mythological creature called Minokawa from Philippine folklore

20

7

$4.6M

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