Open-source video games

roguelike video game, open source, first release version in 1990, community driven development up to now

thumb|254px|Four tribes in Widelands Build 20 thumb|254px|Screenshot of a game taken in 2008 thumb|254px|Screenshot of the "Dolomites" map in Widelands Build 19

1998 video game

free Rogue-like video game

BZFlag (an abbreviation for Battle Zone capture the Flag) is an online multiplayer free and open-source tank game. In the game of BZFlag, players drive around tanks, viewed from a first-person view, in a server-defined world (also known as a "map"), which can be modified.

2008 freeware first-person adventure video game developed by Blendo Games

2013 video game

free to play massively multiplayer online role playing game

thumb|A screenshot of Mindustry gameplay in single-player campaign mode on Serpulo Mindustry is a free and open-source real-time strategy, factory management, and tower defense game developed and published by Anuken under the GNU General Public License v3. It is available for Windows, macOS, Linux, Android and iOS, where it can be downloaded for free from its author. It can also be bought on Steam and the App Store. As an open-source game, players can mod the game and its client without restriction, and it has no advertisements or in-app purchases; development is supported by donations.

XBill is an arcade style game for the X Window System. The game features a bespectacled character known as "Bill" (a spoof of Bill Gates). The goal is to prevent Bill's legions of clones, referred to as "micro-Bills", from installing "Wingdows", a virus "cleverly designed to resemble a popular operating system" (a parody of Windows), on a variety of computers running other operating systems. It was popular among Linux gamers at the end of the 1990s, selected as Linux Journal reader's second favourite Linux game in 1999.

2004 video game

2001 video game

2003 video game

free and open-source FPS video game

thumb|Screenshot of OpenCity 0.0.5 OpenCity is a free and open-source software 3D city-building game started in 2003 by France-based Vietnamese programmer Duong-Khang Nguyen. The game mechanics are similar to SimCity, although the game developers do not strive to make it a direct SimCity clone.

Infiniminer is an open-source multiplayer sandbox game developed by Zachtronics, centered on block-based construction and excavation. Players assume the role of miners on a team, aiming to collect the highest amount of money by mining ore while avoiding and fighting the opposing team. According to its creator, Zachary Barth, the game was inspired by Infinifrag, Team Fortress 2, and Motherload by XGen Studios. The game has been cited as an influence on the development of Minecraft.

2013 video game

2002 video game

2012 video game

Blockout is a puzzle video game published in 1989 by California Dreams. It was developed in Poland by Aleksander Ustaszewski and Mirosław Zabłocki. American Technos published an arcade version. Blockout is a 3D version of the Tetris concept.

2005 video game

1996 video game

Spectromancer () is a computer game developed by Apus Software and Three Donkeys LLC. The game was released in October 2008. The expansions League of Heroes, Truth & Beauty, and Gathering of Power are upgrades to the game rather than stand-alone expansions and, were released in 2010, 2011, and 2013, respectively.

thumb|Bos Wars|Battle of Survival screenshot Stratagus is a free and open-source cross-platform game engine used to build real-time strategy video games. Licensed under the GNU GPL-2.0-only, it is written mostly in C++ with the configuration language being Lua.

2001 video game

free rogue-like computer game

UltraStar is a clone of SingStar, a music video game by Polish developer Patryk "Covus5" Cebula. UltraStar lets one or several players score points by singing along to a song or music video and match the pitch of the original song. UltraStar displays lyrics as well as the correct notes similar to a piano roll. On top of the correct notes UltraStar displays the pitch recorded from the players. UltraStar allows several people to play simultaneously by connecting several microphones possibly to several sound cards. To add a song to UltraStar, a file with notes and lyrics is required, together wit

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2019 video game

C-evo is a free turn-based strategy computer game whose source code is in the public domain by German programmer and designer Steffen Gerlach. It was written in Delphi and later ported to Lazarus instead.

2004 video game

1999 video game

free typing tutor software

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Mari0 (pronounced "mari-zero") is a 2012 side-scrolling platform video game developed by German indie developer Maurice Guégan with creative input from Sašo Smolej and released onto their website Stabyourself.net. It combines gameplay elements from Nintendo's Super Mario series and Valve's Portal series. The game features Mario armed with a "portal gun", the main game mechanic in the Portal series, allowing him to create two inter-spatial portals on 2-dimensional surfaces which can transport himself, enemies and other objects through them. It was made with the LÖVE game framework.

'''''Rocks'n'Diamonds''' is an open source puzzle video game created by Holger Schemel and published in 1995 by Artsoft Entertainment. It is a clone of Boulder Dash, Supaplex, Emerald Mine, and Sokoban''.

Open Game Art is a media repository intended for use with free and open source software video game projects, offering open content assets.

2003 video game

2002 video game

open source real time strategy game

ZZT is a 1991 action-adventure puzzle video game and game creation system developed and published by Potomac Computer Systems for MS-DOS. It was later released as freeware in 1997. It is an early game allowing user-generated content using object-oriented programming. Players control a smiley face to battle various creatures and solve puzzles in different grid-based boards in a chosen world. It has four worlds where players explore different boards and interact with objects such as ammo, bombs, and scrolls to reach the end of the game. It includes an in-game editor, allowing players to develop

2012 video game

space trading and combat video game

YSFlight is a free, open-source multi-platform flight simulator, developed and published by Soji Yamakawa since 1999. Since its initial release, it has received annual updates, with the most recent stable version released in 2018.

2012 video game

Ryzom, also known as The Saga of Ryzom, is a free and open source massively multiplayer online role-playing game (MMORPG) for Microsoft Windows, OS X, and Linux. It was developed by Nevrax, released in 2004, and became free software in 2010. It takes place in a science fantasy world called Atys.

2017 video game developed by Wolfire Games

TetriNET is a multiplayer online Tetris game for up to six people that supports team play.

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GLtron is a 3D snake game based on the light cycle portion of the film Tron. The game is free and open-source software and has been ported to many mobile and non-mobile operating systems such as Windows, MacOS, Symbian and Android over the years.

2013 video game

1983 video game

1984 roguelike video game

2009 video game

2000 video game

Vangers (Вангеры, also known as Vangers: One for the Road) is a racing role-playing video game developed by K-D Lab, a Russian company. It was released in North America in June 29, 1998 after receiving positive responses at that year's E3. An updated re-release was made available on Steam and GOG.com in 2014. The re-release includes support for Mac OS X and Linux.

computer math learning game

1997 video game

S&box (pronounced Sandbox) is an upcoming open source video game development platform and engine by Facepunch Studios. It is built using a heavily modified Source 2 engine and will be released on April 28, 2026. S&box is intended to be a spiritual successor to ''Garry's Mod'' and is designed to allow users to create a variety of games and experiences.