Plot: Tenés Empanadas Graciela is a turn-based strategy game distributed by several popular Linux distributions. The idea for this free and open-source software program came from the board game TEG, which itself is based on the popular Risk game but differs in many aspects of the rules. Wikipedia
Plot: Liquid War is an open source multi-player action game based on particle flow mechanic. Thomas Colcombet developed the core concept and the original shortest path algorithm, the software was programmed by Christian Mauduit. Liquid War 6 is a GNU package distributed as free software and part of the GNU...
Plot: Enigma is a puzzle video game based on Oxyd, and is released under the GPL. Enigma continues to be very popular as an open source multi-platform derivative of Oxyd now that Oxyd is no longer maintained. The open source fangame Enigma has been praised in reviews. Enigma is a marble game. 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: 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: 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, while the game developers don't strive to make it a direct Simcity clone. Wikipedia
Plot: World of Padman is an open-source first-person shooter video game by German developer Padworld Entertainment available in both English and German. Wikipedia