Airline TycoonW
Airline Tycoon

Airline Tycoon is a business simulation game by Thomas Holz and Robert Kleinert, in which the player must successfully manage an airline. The original was developed by Spellbound, and published by Infogrames Deutschland, however, the succeeding versions were published by a variety of publishers. The original Airline Tycoon was created for Windows, however, the later Deluxe version was also ported to Linux, Mac OS X, MorphOS, ZETA, iOS and Android.

The Battle for WesnothW
The Battle for Wesnoth

The Battle for Wesnoth is a free and open-source turn-based strategy video game with a high fantasy setting, designed by Australian-American developer David White and first released in June 2003. In Wesnoth, the player attempts to build a powerful army by controlling villages and defeating enemies for experience. The game is loosely based on the Sega Genesis games Master of Monsters and Warsong.

Battle SquadronW
Battle Squadron

Battle Squadron is a vertically scrolling shooter for the Amiga and ported a year later to the Mega Drive console, for one or two players. It is a sequel to Hybris. The game was later ported to iOS devices (2011), Android (2012) and in 2013 also to AmigaOS 4, Windows, OS X and MorphOS.

Bos WarsW
Bos Wars

Bos Wars is an open source, cross-platform real-time strategy video game.

Cave StoryW
Cave Story

Cave Story, originally released as Dōkutsu Monogatari, is a 2004 Metroidvania platform-adventure game for Microsoft Windows. It was developed over five years by Japanese developer Daisuke "Pixel" Amaya in his free time. Cave Story features 2D platform mechanics and is reminiscent of the games Amaya played in his youth, such as Metroid and Castlevania. After its initial self-published release, the game slowly gained popularity on the internet. It received widespread critical acclaim for many polished aspects of its design, such as its compelling characters, setting, story, and gameplay. Cave Story is considered by many as the quintessential indie game because of its one-person development team and influence on the gaming world.

Cube 2: SauerbratenW
Cube 2: Sauerbraten

Cube 2: Sauerbraten is a cross-platform, Quake-like first-person shooter that runs on Microsoft Windows, Linux, FreeBSD, OpenBSD, and Mac OS X using OpenGL and SDL. The game features single-player and multiplayer gameplay and contains an in-game level editor. The game engine is free and open-source software, under the zlib License, with commercial support available from the developer's business counterpart, Dot3 Labs. The game media is released under various non-free licenses. The aim of the project is not to produce the most features and highest-quality graphics possible, but rather to allow map-editing to be done in real-time within the game, while keeping the engine source code small and elegant.

Doom (1993 video game)W
Doom (1993 video game)

Doom is a 1993 first-person shooter (FPS) game developed by id Software for MS-DOS. Players assume the role of a space marine, popularly known as Doomguy, fighting his way through hordes of invading demons from Hell. The first episode, comprising nine levels, was distributed freely as shareware and played by an estimated 15–20 million people within two years; the full game, with two further episodes, was sold via mail order. An updated version with an additional episode and more difficult levels, The Ultimate Doom, was released in 1995 and sold at retail.

Duke Nukem 3DW
Duke Nukem 3D

Duke Nukem 3D is a first-person shooter video game developed by 3D Realms. It is a sequel to the platform games Duke Nukem and Duke Nukem II, published by 3D Realms.

Dune IIW
Dune II

Dune II: The Building of a Dynasty is a real-time strategy Dune video game developed by Westwood Studios and released by Virgin Games in December 1992. It is based upon David Lynch's 1984 movie Dune, an adaptation of Frank Herbert's science fiction novel of the same name.

The Feeble FilesW
The Feeble Files

The Feeble Files is an adventure video game about the adventures of an alien called Feeble. The game is a science fiction comedy, with a similar style of British humour to that of Adventure Soft's previous games, the Simon the Sorcerer series.

FooBillardW
FooBillard

FooBillard is a free and open-source, OpenGL-based sports simulation video game.

FreecivW
Freeciv

Freeciv is a single- and multiplayer, turn-based strategy game for workstations and personal computers inspired by the proprietary Sid Meier's Civilization series. It is available for most desktop computer operating systems and available in an online browser version. Released under the GNU GPL-2.0-or-later, Freeciv is free and open source software. The game's default settings are closest to Civilization II, in both gameplay and graphics, including the units and the isometric grid. Freeciv is playable online at freecivweb.org

Frogatto & FriendsW
Frogatto & Friends

Frogatto & Friends is a platform game with adventure elements released in July 2010. The game received positive reviews, particularly for its "gorgeous" pixel art. The game is cross-platform and runs on Linux, AmigaOS4, AROS, Mac OS X, Microsoft Windows, iOS and BlackBerry Tablet OS. The game uses an open-source engine, with game data mostly proprietary and partly under Creative Commons BY license.

Heretic IIW
Heretic II

Heretic II is a dark fantasy action-adventure game developed by Raven Software and published by Activision in 1998 continuing the story of Corvus, the main character from its predecessor, Heretic. It is the fourth game in the Hexen: Beyond Heretic series and comes after the "Serpent Rider" trilogy. Although Id Software owns the publishing rights to the previous titles, Heretic 2 is owned by Activision since they own Raven Software and its IPs.

Knights and Merchants: The Shattered KingdomW
Knights and Merchants: The Shattered Kingdom

Knights and Merchants: The Shattered Kingdom is a medieval-time based real-time strategy (RTS) video game. It was developed by Joymania Entertainment and published by TopWare Interactive in 1998. The player takes the role of the captain of the palace guards and leads the soldiers and citizens to victory. An expansion pack was released in 2001, titled Knights and Merchants: The Peasants Rebellion.

OpenTTDW
OpenTTD

OpenTTD is a business simulation game in which players try to earn money by transporting passengers and freight via road, rail, water and air. It is an open-source remake and expansion of the 1994 Chris Sawyer video game Transport Tycoon Deluxe.

Project StarfighterW
Project Starfighter

Project: Starfighter is a 2D shoot 'em up written by Parallel Realities. It is a mission and objective based game also featuring an intricate plot. The game was later released by Sweeney as Freeware and the engine's source code was opened to the public. The game is now maintained and updated by the game's community as Free and open-source software.

Quake III ArenaW
Quake III Arena

Quake III Arena is a 1999 multiplayer-focused first-person shooter developed by id Software. It is the third game in the Quake series and also the first spin-off to Quake; it differs from previous games by excluding a story-based single-player mode and focusing on multiplayer gameplay. The single-player mode is played against computer-controlled bots. It features music composed by Sonic Mayhem and Front Line Assembly founder Bill Leeb.

Return to Castle WolfensteinW
Return to Castle Wolfenstein

Return to Castle Wolfenstein is a first-person shooter video game published by Activision, released on November 19, 2001, for Microsoft Windows and subsequently for PlayStation 2, Xbox, Linux and Macintosh. The game serves as both a remake and a reboot to the Wolfenstein series. It was developed by Gray Matter Interactive and Nerve Software developed its multiplayer mode. id Software, the creators of Wolfenstein 3D, oversaw the development and were credited as executive producers. The multiplayer side eventually became the most popular part of the game, and was influential in the genre. Splash Damage created some of the maps for the Game of the Year edition. A sequel, titled Wolfenstein, was released on August 18, 2009.

Robin Hood: The Legend of SherwoodW
Robin Hood: The Legend of Sherwood

Robin Hood: The Legend of Sherwood is a 2002 stealth-based real-time tactics video game developed by Spellbound Studios. It is similar to games such as Desperados: Wanted Dead or Alive and the Commandos series. In the game, the player controls up to five characters in a setting based on the stories of the protagonist, Robin Hood. The player can also control Robin Hood's Merry Men, including Little John, Friar Tuck, Will Scarlet, Will Stutely, and Maid Marian. Robin and his crew must evade the cruel Sheriff of Nottingham and his henchmen and stop the machinations of the vile usurper to England's throne, Prince John. However, Robin must avoid killing enemies as much as possible, or he will not be able to recruit as many new Merry Men.

Rocks'n'DiamondsW
Rocks'n'Diamonds

Rocks'n'Diamonds is a puzzle video game with elements of Boulder Dash, Supaplex, Emerald Mine, Solomon's Key, and Sokoban clone. It is free software under the GNU GPL-2.0-only license created by Artsoft Entertainment and designed by Holger Schemel.

SimutransW
Simutrans

Simutrans is a cross-platform simulation game in which the player strives to run a successful transport system by constructing and managing transportation systems for passengers, mail and goods by land, air (airplanes) and water (ship) between places. Like OpenTTD, Simutrans is an open-source transportation game based on the Transport Tycoon idea.

StratagusW
Stratagus

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.

SuperTuxKartW
SuperTuxKart

SuperTuxKart (STK) is a free and open-source kart racing game, distributed under the terms of the GNU General Public License, version 3. It features mascots of various open-source projects. SuperTuxKart is cross-platform, running on Linux, macOS, Windows, iOS (beta), Android systems and Nintendo Switch (homebrew).

TORCSW
TORCS

TORCS is an open-source 3D car racing simulator available on Linux, FreeBSD, Mac OS X, AmigaOS 4, AROS, MorphOS and Microsoft Windows. TORCS was created by Eric Espié and Christophe Guionneau, but project development is now headed by Bernhard Wymann. It is written in C++ and is licensed under the GNU GPL. TORCS is designed to enable pre-programmed AI drivers to race against one another, while allowing the user to control a vehicle using either a keyboard, mouse, or wheel input.

Speed DreamsW
Speed Dreams

Speed Dreams, often shortened to SD and formerly known as Torcs-NG, is a free and open source 3D racing video game for Linux, Microsoft Windows, AmigaOS 4, AROS, MorphOS and Haiku. Started in 2008 as a fork of the racing car simulator TORCS, it is mainly written in C++ and released under GPL v2+ and Free Art License, the most recent release being version 2.2 of March 2016.

Warzone 2100W
Warzone 2100

Warzone 2100 is an open-source real-time strategy and real-time tactics hybrid computer game, originally developed by Pumpkin Studios and published by Eidos Interactive. It was originally released in 1999 for Microsoft Windows and PlayStation, and is now also available for macOS, FreeBSD, AmigaOS 4, AROS, MorphOS, Linux, NetBSD and OpenBSD.

Wolfenstein: Enemy TerritoryW
Wolfenstein: Enemy Territory

Wolfenstein: Enemy Territory is a free and open-source multiplayer first-person shooter video game set during World War II. It was originally planned to be released as a commercial expansion pack to Return to Castle Wolfenstein and later as a standalone game. However, due to problems with the single-player aspect, the multiplayer portion was released on 29 May 2003 as a freeware standalone game. In January 2004, the source code for the game logic was released to the benefit of its modding community.