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Free Open Source Games

Games on this list were included based on recommendations, if you'd like to a game added to this list, please post it on the sticky of /f/Games. For a more comprehensive list, please see this Wikipedia page.

  1. Adventure/RPG

  2. Arcade/Casual

  3. City Builder/Tycoon

  4. First Person Shooter

  5. MMORPG

  6. Minecraft Clones

  7. Puzzle

  8. Racing

  9. Roguelikes

  10. RPG

  11. Side-Scroller

  12. Simulation

  13. Space Sim/Trading/RPG

  14. Strategy

Adventure/RPG

  • Beneath a Steel Sky - Classic adventure game with excellent artwork and voice talent. Should be available in the Ubuntu repos
  • Eldevin - F2P Runescape clone with a distinct charm
  • Flare - A surprisingly in-depth and polished isometric RPG
  • Heroine's Quest - Fantastic free Point'n'Click RPG inspired by the Quest for Glory series from Sierra
  • Lugaru - Turner, is an anthropomorphic rebel bunny rabbit with impressive combat skills. In his quest to find those responsible for slaughtering his village.
  • ScummVM's Freeware Games - Some fantastic point'n'click games here, my favourite probably being Dreamweb
  • Solarus Games - Solarus is a game engine for making Zelda-like games, but there are many completed games available on their website, and also community made games

Arcade/Casual

City Builder/Tycoon

  • OpenTTD - open-source clone of Transport Tycoon Deluxe
  • Scorched 3D - Simple turn-based or real-time artillery strategy game
  • Simutrans - Open-source transportation simulator clone.
  • Unknown Horizons - Village builder inspired by the Anno series
  • Widelands - Polished Settlers clone

First Person Shooter

  • Alien Arena - Retro Sci-Fi Online FPS
  • ET Legacy - Wolfenstein: Enemey Territory for modern systems
  • Cube 2 - Quake-like Arena online FPS with multiple game modes
  • Freedoom - The Freedoom project aims to create a complete free content game based on the Doom engine.
  • OpenArena - Online arena FPS using the id tech engine
  • Ravenfield - Singleplayer Battlefield type game
  • Red Eclipse (GNU/Linux, BSD, Windows & Mac) - a free online arena shooter with parkour.
  • Termulous - RTS/FPS Hybrid with aliens!
  • The Dark Mod - Fan-made spin-off the the fantastic Thief series (Not suitable for low-end systems)
  • Urban Terror - Fast paced online FPS reminiscent of Counter-Strike
  • Warsow (GNU/Linux, Windows & Mac) - a fast-paced FPS in a futuristic cartoonish world.
  • Xonotic (GNU/Linux, BSD, Windows & Mac) - a free online shooter, based on Quake.

MMORPG

  • Ryzom A game where there are no classes to choose, nor force to choose a faction or guild.

Minecraft Clones

Puzzle

Racing

  • Speed Dreams - Realistic racing sim
  • SuperTuxCart - Open-source clone of the Mario Cart games (Not suitable for low-end systems)
  • Yorg - A top-down racer in the Micro Machine's style.

Roguelikes

RPG

  • Angband (GNU/Linux, Windows, Mac & Android) - a single-player dungeon exploration game in the universe of JRR Tolkien.
  • Shattered Pixel Dungeon (Android) - a traditional roguelike game with pixel-art graphics and simple interface.
  • Cataclysm DDA - Cataclysm: Dark Days Ahead is a turn-based survival game set in a post-apocalyptic world
  • Star Ruler 2 - Explore, expand, exploit and exterminate your way to become the ruler of the Galaxy.

Side-Scroller

Simulation

  • Minetest (GNU/Linux, FreeBSD, Windows, Mac & Android) - a near-infinite-world block sandbox game, inspired by InfiniMiner, Minecraft, and the like.
  • OpenTTD (GNU/Linux, Windows & Mac) - a transport simulation game based upon the popular game Transport Tycoon Deluxe, written by Chris Sawyer.
  • OpenRCT2 (GNU/Linux, Windows & Mac) - An open source reverse engineering of Rollercoaster Tycoon 2. Requires assets from the original game, acquirable here

Space Sim/Trading/RPG

Strategy

  • 0 A.D. (GNU/Linux, Windows, Mac) - a game of ancient warfare.
  • The Battle For Wesnoth (GNU/Linux, Windows, Mac, Android & iOS) - a turn-based strategy game with a high fantasy theme.
  • Freeciv (GNU/Linux, Windows) - A clone of Civilization II from the Sid Meier's Civilization series.
  • Widelands (GNU/Linux, BSD, Windows & Mac) - A real-time strategy game focused on building an economy. Based on Settlers 2.
  • FreeCol - Clone of Colonization
  • FreeOrion - Clone of Master of Orion
  • OpenRA - Open-Source implementation of C&C: Red Alert, Tiberian Sun, and Dune 2000
  • Tanks of Freedom - Turn based strategy, similar to Advance Wars on the GBA.
  • Hedgewars - Clone of the game Worms
  • UFO: Alien Invasion - Turn-based tactical combat game, inspired by the X-Com series.
  • Argentum Age - Open-source fantasy card game
  • UFO2000 - Another X-Com inspired game
  • Wyrmsun - An interesting fantasy RTS
  • Spring RTS - RTS game engine that has a few complete games made from it, like Zero-K
  • Warzone 2100 - 3D RTS that offers campaign, multi-player, and single-player skirmish modes.
  • Megaglest - RTS where you control the armies of one of seven different factions
  • PokerTH - Free online poker with the best open source texas holden poker game and a great community
  • Seven Kingdoms: Ancient Adversaries - GPL release of Seven Kingdoms: Ancient Adversaries

Source code

Games on this list were included based on recommendations, if you'd like to a game added to this list, please post it on the sticky of /f/Games. For a more comprehensive list, [please see this Wikipedia page](https://en.wikipedia.org/wiki/List_of_open-source_video_games).

# Adventure/RPG

* [Beneath a Steel Sky](https://www.gog.com/game/beneath_a_steel_sky) - Classic adventure game with excellent artwork and voice talent. Should be available in the Ubuntu repos
* [Eldevin](https://www.eldevin.com/) - F2P Runescape clone with a distinct charm
* [Flare](http://flarerpg.org/) - A surprisingly in-depth and polished isometric RPG
* [Heroine's Quest](http://crystalshard.net/?g=16) - Fantastic free Point'n'Click RPG inspired by the Quest for Glory series from Sierra
* [Lugaru](http://www.wolfire.com/lugaru) - Turner, is an anthropomorphic rebel bunny rabbit with impressive combat skills. In his quest to find those responsible for slaughtering his village.
* [ScummVM's Freeware Games](https://www.scummvm.org/games) - Some fantastic point'n'click games here, my favourite probably being Dreamweb
* [Solarus Games](http://www.solarus-games.org/games/solarus-team/) - Solarus is a game engine for making Zelda-like games, but there are many completed games available on their website, and also [community made games](http://www.solarus-games.org/games/community/)


# Arcade/Casual

* [Altitude](https://store.steampowered.com/app/41300/Altitude/) - 2D Online plane combat
* [Chromium-BSU](http://chromium-bsu.sourceforge.net/) - Top-down arcade Shmup
* [Kobo Deluxe](http://olofson.net/kobodl/) - 8-way scrolling shooter
* [LBreakout2](http://lgames.sourceforge.net/LBreakout2/) - Open-source breakout clones.
* [OpenTyrian](https://bitbucket.org/opentyrian/opentyrian/wiki/Home) - The famous Shmup
* [SSVOpenHexagon](http://vittorioromeo.info/projects.html) - Open-source clone of Super Hexagon. [Source code](https://github.com/SuperV1234/SSVOpenHexagon) for packagers
* [TeeWorlds](https://store.steampowered.com/app/380840/) - Online 2D shooter
* [Witch Blast](https://dev.solus-project.com/T1335) - Open-source clone of Binding of Isaac. [Source code here](https://github.com/Cirrus-Minor/witchblast) for packgers.


# City Builder/Tycoon

* [OpenTTD](https://www.openttd.org/en/) - open-source clone of Transport Tycoon Deluxe
* [Scorched 3D](http://www.scorched3d.co.uk/) - Simple turn-based or real-time artillery strategy game
* [Simutrans](https://www.simutrans.com/en/) - Open-source transportation simulator clone.
* [Unknown Horizons](http://unknown-horizons.org/) - Village builder inspired by the Anno series
* [Widelands](https://wl.widelands.org/) - Polished Settlers clone


# First Person Shooter

* [Alien Arena](http://red.planetarena.org/) - Retro Sci-Fi Online FPS
* [ET Legacy](https://www.etlegacy.com/) - Wolfenstein: Enemey Territory for modern systems
* [Cube 2](http://sauerbraten.org/) - Quake-like Arena online FPS with multiple game modes
* [Freedoom](https://freedoom.github.io) - The Freedoom project aims to create a complete free content game based on the Doom engine.
* [OpenArena](http://openarena.ws/smfnews.php) - Online arena FPS using the id tech engine
* [Ravenfield](https://steelraven7.itch.io/ravenfield) - Singleplayer Battlefield type game
* [Red Eclipse](http://redeclipse.net) (GNU/Linux, BSD, Windows & Mac) - a free online arena shooter with parkour.
* [Termulous](http://www.tremulous.net/) - RTS/FPS Hybrid with aliens!
* [The Dark Mod](http://www.thedarkmod.com/) - Fan-made spin-off the the fantastic Thief series **(Not suitable for low-end systems)**
* [Urban Terror](https://www.urbanterror.info/home/) - Fast paced online FPS reminiscent of Counter-Strike
* [Warsow](https://warsow.net/) (GNU/Linux, Windows & Mac) - a fast-paced FPS in a futuristic cartoonish world.
* [Xonotic](http://www.xonotic.org/) (GNU/Linux, BSD, Windows & Mac) - a free online shooter, based on Quake.


# MMORPG

* [Ryzom](https://ryzom.com/) A game where there are no classes to choose, nor force to choose a faction or guild.


# Minecraft Clones

* [ClassicalSharp](https://github.com/UnknownShadow200/ClassicalSharp)
* [Craft](https://www.michaelfogleman.com/projects/craft/)
* [Freeminer](https://github.com/freeminer/freeminer)
* [Lamecraft](https://code.google.com/archive/p/lamecraft/)
* [Manic Digger](http://manicdigger.github.io/)
* [Minetest](https://www.minetest.net/) - Uses C++, Requires mods to be fun
* [Terasology](https://terasology.org/) - Fancy lookin' Minecraft
* [TrueCraft](https://github.com/SirCmpwn/TrueCraft) - Clean-room implementation of Minecraft 1.7.3
* [Voxelands](https://www.voxelands.com/) - standard clone?
* [voxel.js](http://voxeljs.com/) - Tool for creating minecraft clones


# Puzzle

* [2048](http://gabrielecirulli.github.io/2048/) (Browser) - a sliding addition game.
* [Blockout2](http://www.blockout.net/blockout2/) - 3D Tetris
* [Duck Marines](http://tangramgames.dk/games/duckmarines/) - Open-source clone of Chu Chu Rocket. [Source code here](https://github.com/SimonLarsen/duckmarines) for distro packagers.
* [FloboPuyo](http://www.ios-software.com/flobopuyo-en) - Open-source clone of PuyoPuyo. [Source-code](http://www.fovea.cc/files/flobopuyo) for packagers
* [Frozen Bubble](http://www.frozen-bubble.org/home/) - Open-source clone of Bubble Bobble.
* [Not Tetris 2](http://stabyourself.net/nottetris2/) - Tetris with physics
* [Pingus](https://pingus.seul.org/) - Lemmings clone.
* [Portable Puzzle Collection](https://www.chiark.greenend.org.uk/%7Esgtatham/puzzles/) - 39 old school puzzle games


# Racing

* [Speed Dreams](http://speed-dreams.org/) - Realistic racing sim
* [SuperTuxCart](https://supertuxkart.net/Main_Page) - Open-source clone of the Mario Cart games **(Not suitable for low-end systems)**
* [Yorg](http://www.ya2.it/pages/download.html#download) - A top-down racer in the Micro Machine's style.



# Roguelikes

* [Roguebox Adventures](https://rogueboxadventures.tuxfamily.org/) - Neat little graphical rogue-like with a focus on survival and crafting. [Source code here](https://notabug.org/themightyglider/RogueBoxAdventuresMirror) for packagers
* [Cataclysm: Dark Days Ahead](http://en.cataclysmdda.com/) - Unique zombie survival rogue-like, very thrilling to play.
* [UnReal World](http://www.unrealworld.fi/) - Crazy in-depth survival roguelike based in iron age Finland
* [Dungeon Crawl Soup](https://crawl.develz.org/) - A roguelike adventure to find the mystifyingly fabulous Orb of Zot.
* [NetHack](https://www.nethack.org/) - Does this need an introduction?
* [Brogue](https://sites.google.com/site/broguegame/home) - Don't know much about this one
* [Tales of Maj'Eyal: Age of Ascendancy](https://te4.org/) - Ultra polished graphical roguelike with the option to save your game
* [ADOM (Ancient Domains of Mystery)](https://www.adom.de/home/index.html) - Another great roguelike, with a huge world and many ways to play
* [DoomRL](https://drl.chaosforge.org/) - DOOM, but roguelike!


# RPG

- [Angband](http://rephial.org/) (GNU/Linux, Windows, Mac & Android) - a single-player dungeon exploration game in the universe of JRR Tolkien.
- [Shattered Pixel Dungeon](http://www.shatteredpixel.com/) ([Android](https://f-droid.org/packages/com.shatteredpixel.shatteredpixeldungeon/)) - a traditional roguelike game with pixel-art graphics and simple interface.
- [Cataclysm DDA](https://cataclysmdda.org/) - Cataclysm: Dark Days Ahead is a turn-based survival game set in a post-apocalyptic world
- [Star Ruler 2](https://github.com/BlindMindStudios/StarRuler2-Source) - Explore, expand, exploit and exterminate your way to become the ruler of the Galaxy.


# Side-Scroller

* [Mr. Rescue](http://tangramgames.dk/games/mrrescue/) - Play as a fireman rescuing people. [Source code here](https://github.com/SimonLarsen/mrrescue) for people who want to package it for their distro
* [Sienna](http://tangramgames.dk/games/sienna/) - Fun little runner/platformer. [Source code](https://github.com/SimonLarsen/sienna) 
* [Super Tux](http://www.supertux.org/) - Open-source Mario clone, and [currently in need of help if it's to stay alive](https://www.reddit.com/r/linux_gaming/comments/8tmc1x/classic_open_source_game_super_tux_seeking_help/)
* [Secret Maryo](http://secretmaryo.org/) - Mario 3 Clone
* [Hurrican](https://www.winterworks.de/project/hurrican/) - Inspired by the classic game Turrican. Mostly forgotten nowadays, so [you may have to compile it from here](https://sourceforge.net/p/hurrican/code/HEAD/tree/trunk/)
* [Frogatto](https://frogatto.com/) - Platformer with great music and graphics. Should be available in the Ubuntu repos for free
* [Commander Keen 4](https://davidgow.net/keen/omnispeak.html) - Classic Shareware DOS title ported to Linux
* [OpenClonk](https://www.openclonk.org/) - Weird Online 2D Mining 
* [Mari0](http://stabyourself.net/mari0/#download) - Odd mix of Mario and Portal.


# Simulation

- [Minetest](https://www.minetest.net/#about) (GNU/Linux, FreeBSD, Windows, Mac & Android) - a near-infinite-world block sandbox game, inspired by InfiniMiner, Minecraft, and the like.
- [OpenTTD](https://www.openttd.org/en/) (GNU/Linux, Windows & Mac) - a transport simulation game based upon the popular game Transport Tycoon Deluxe, written by Chris Sawyer.
- [OpenRCT2](https://openrct2.io/) (GNU/Linux, Windows & Mac) - An open source reverse engineering of Rollercoaster Tycoon 2. Requires assets from the original game, acquirable [here](http://cdn.limetric.com/games/openrct2/misc/RollerCoasterTycoon2TTP_EN.zip)


# Space Sim/Trading/RPG

* [Ur-Quan Masters](http://sc2.sourceforge.net/) - Updated version of Star Control II. Be sure to download the Voice Pack! ([Alternative HD version available here](https://sourceforge.net/projects/urquanmastershd/))
* [Endless Sky](https://endless-sky.github.io/) - 2D space trading and combat game similar to the classic Escape Velocity series
* [Oolite](http://www.oolite.org/) - Well done Elite remake, with plentiful mod support.
* [Pioneer](http://pioneerspacesim.net/#&panel1-1) - a remake of the sequel to Elite, Frontier.
* [Vega Strike](http://vegastrike.sourceforge.net/) - Open Source 3D Action-Space-Sim
* [Naev](https://store.steampowered.com/app/598530/Naev/) - open-source game about space exploration, trade and combat


# Strategy

- [0 A.D.](https://play0ad.com) (GNU/Linux, Windows, Mac) - a game of ancient warfare.
- [The Battle For Wesnoth](https://www.wesnoth.org/) (GNU/Linux, Windows, Mac, Android & iOS) - a turn-based strategy game with a high fantasy theme.
- [Freeciv](http://www.freeciv.org/) (GNU/Linux, Windows) - A clone of Civilization II from the Sid Meier's Civilization series.
- [Widelands](https://wl.widelands.org/) (GNU/Linux, BSD, Windows & Mac) - A real-time strategy game focused on building an economy. Based on Settlers 2.
* [FreeCol](http://www.freecol.org/news/freecol-0.11.6-released.html) - Clone of Colonization
* [FreeOrion](http://www.freeorion.org/index.php/Main_Page) - Clone of Master of Orion
* [OpenRA](http://www.openra.net/) - Open-Source implementation of C&C: Red Alert, Tiberian Sun, and Dune 2000
* [Tanks of Freedom](https://w84death.itch.io/tanks-of-freedom) - Turn based strategy, similar to Advance Wars on the GBA.
* [Hedgewars](http://www.hedgewars.org/) - Clone of the game Worms
* [UFO: Alien Invasion](https://ufoai.org/wiki/News) - Turn-based tactical combat game, inspired by the X-Com series.
* [Argentum Age](http://www.argentumage.com/) - Open-source fantasy card game
* [UFO2000](http://ufo2000.sourceforge.net/) - Another X-Com inspired game
* [Wyrmsun](https://andrettin.github.io/) - An interesting fantasy RTS
* [Spring RTS](https://springrts.com/) - RTS game engine that has a few complete games made from it, like Zero-K
* [Warzone 2100](https://wz2100.net/) - 3D RTS that offers campaign, multi-player, and single-player skirmish modes.
* [Megaglest](https://megaglest.org/) - RTS where you control the armies of one of seven different factions
* [PokerTH](https://www.pokerth.net/download) - Free online poker with the best open source texas holden poker game and a great community
* [Seven Kingdoms: Ancient Adversaries](https://www.7kfans.com/wiki/index.php/Download) - GPL release of Seven Kingdoms: Ancient Adversaries