Alien Arena is a fast, free FPS deathmatch game.

AU Modern FPS is a browser-based game.

OpenArena is a free and open-source video game, it is first-person shooter (FPS) and a video game clone of Quake III Arena.

Tremulous is a free and open source team-based first-person shooter with real-time strategy elements.

Warsow, also stylized as War§ow, is an open source first-person shooter video game.

AssaultCube (ActionCube) is a free and open source software first-person shooter video game.

Counter-Strike is a series of multiplayer first-person shooter video games, in which teams of terrorists and counter-terrorists battle to, respectively, perpe…

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

Urban Terror is a freeware multiplayer first-person shooter video game.

Xonotic is a free and open-source first-person shooter video game.