Half-Life is a series of first-person shooter video games that share a single science fiction alternate history.

Alien Swarm is a freeware multiplayer top-down shooter video game.

Alien Arena is a fast, free FPS deathmatch game.

Quake is a series of first-person shooter video games, starting with the game of the same name.

Unvanquished is an opensource first-person strategy shooter game.

TrackMania (series) is a custom track building racing game.