Sci-Fi

Bet On Soldier: Blood Sport is a 2005 game from Digital Jesters

Cube 2: Sauerbraten (German for "sour roast", also known as Sauer) is a cross-platform, Quake-like first-person shooter that runs on Microsoft Windows, Linux, FreeBSD and Mac OS X using OpenGL and SDL. The game features single-player and multiplayer gameplay and contains an in-game level editor, its main feature. The game engine is free and open source software, under the zlib License, with commercial support available from the developer's own business counterpart, Dot3 Labs.

Counter-Strike: Condition Zero is a 2004 release for the PC

Terminator 3: War of the Machines is a team-oriented multiplayer FPS from Clever's Games and Atari. It is based on the Terminator 3 universe (having loved The Terminator and hated T2, I haven't seen T3 and can't comment on whether the game follows the movie or not). It takes place in the year 2029, where the machines are attempting to take over the world, and the humans are trying to stop them. You play as a grunt on either side in one of the many battles that occur. Gameplay closely resembles Battlefield 1942.

The first installment of the series was released worldwide on August 31, 1995 and was named Command & Conquer with the subtitle of Tiberian Dawn. It was based on Westwood Studios' earlier strategy game Dune 2.

Cube is an abstract sci-fi FPS game for the PC from 2002

Half-Life 2 is an FPS from Valve Software, and was one of the most highly anticipated sequels of all time. You return as Gordon Freeman, the strong and silent-type physicist, and you must do battle with an alien race of enslavers to liberate the surviving remainder of humanity on earth.

Dark Reign 2 is an RTS from Pandemic Studios and Activision. The game takes place in the earth's future, where two factions, the JDA and Sprawlers, are fighting a perpetual war that is gradually destroying the earth. Dark Reign 2 features a 3D engine, 2 campaigns, and fairly standard RTS gameplay.

Blood II: The Chosen is a first-person shooter computer game developed by Monolith Productions. Unlike the first installment, Blood, which was set in 1928, it takes place in the year 2028, so in addition to conventional weapons and magical items also incorporates science-fictional technology. Much like its predecessor, the game contains excessive graphic violence and black humor.