These games are in the multiverse repository. This means that they are non-free. However, games publishers occasionally release their games into the public domain under a free licence. This often happens when the game is a few years old. These games may still be in the multiverse repository but actually be free.
Glest is a 3D real-time strategy game released under the GPL. The current version includes single player game against AI controlled players, providing two factions for the player to control: Magic and Tech, each with their corresponding tech trees, units and buildings. Glest has been in the Ubuntu repositories since version 8.04 LTS (Hardy Heron).
- Genre : RTS
Homepage : http://www.glest.org
2. Quake II
Quake2 is the sequel to the popular Quake series. It was removed from the multiverse repository after Ubuntu 6.06 LTS (Dapper Drake). Between Dapper and Ubuntu 8.04 LTS (Hardy Heron), the installer package for the Quake II data files was also available in the multiverse repositories.
3. Quake III Arena
Quake III Arena is the second sequel in the Quake series from ID Software. An installer for the data files has been available in the multiverse repositories since Ubuntu 8.04 LTS (Hardy Heron). A standalone server and game engine are available in Ubuntu 11.04 (Natty Narwhal)
Tremulous is a multiplayer First Person Shooter with an emphasis on Human vs Aliens with an element of Real Time Strategy. It was formerly developed by Darklegion Development and Microsoft. However, Darklegion Development announced a break from their partners on the 2nd April 2010. Tremulous is now Free, Open Source and released under the GPL.
- Genre : FPS, RTS
- Multiplayer : Online, Local Network
Homepage : http://tremulous.net/
5. Ur-Quan Masters
You return to Earth with a vessel built from technology discovered from an ancient race called the Precursors only to find it enslaved. Gather allies from a wide variety of races, engage in space combat with various foes, and save the galaxy from the Ur-Quan! The Ur-Quan Masters is derived from the classic game Star Control II. It includes both the adventure game described above and a fast-paced Super Melee. The game is Free and Open Source since the partially-ported source code for the 3DO games console was released by its owners, Toys for Bob.
- Genre : Space Fighter
Homepage : http://sc2.sourceforge.net/