Plot: VDrift is a cross-platform, free/open source driving simulation made with drift racing in mind. It is released under the GNU General Public License v3. It is currently available for Linux, FreeBSD, Mac OS X and Microsoft Windows. Wikipedia
Plot: SuperTuxKart 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, and Android systems. Wikipedia
Plot: Vega Strike is a first-person space trading and combat simulator, developed for Microsoft Windows, Linux, FreeBSD and OS X systems. Many of the core game mechanics of Vega Strike are indirectly inspired by Elite. Other games, such as Wing Commander: Privateer, influenced the original developer. Wikipedia...
Plot: 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. Wikipedia
Plot: Armagetron Advanced is a multiplayer snake game in 3D based on the light cycle sequence from the film Tron. It is available for Linux, macOS, Microsoft Windows, AmigaOS 4 and OpenBSD as free and open-source software. Wikipedia
Plot: 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. Wikipedia
Plot: Secret Maryo Chronicles is a free and open-source two-dimensional platform computer game that began in 2003. The game has been described by the German PCtipp as a Super Mario Bros. clone. Wikipedia