This second list includes free online first-person shooters that are unrealistic and usually set in the future. These FPS's often have similarities to shooters like Quake or Unreal Tournament. Most of them have relatively fast-paced gameplay and fictional weaponry like gravity guns and plasma weapons. There are around 10 games in this list that also have Linux and/or Mac versions. Some shooters may have very low player base or no players at all.
Team Fortress 2
Team Fortress 2 is a team-based multiplayer first-person shooter that recently became a free-to-play game. This shooter has cartoon style graphics and nine different player classes.
System requirements: 1.7 GHz CPU, 512MB RAM, DirectX 8.1 level graphics card.
http://www.tf2.com/ (also available for Mac)
Quake Live is a browser-based variant of famous online first-person shooter, Quake III Arena. Some arenas, game types and server options are not available for free users.System requirements: 800 MHz CPU, 512MB RAM, NVIDIA GeForce4 MX / ATI Radeon 8500.
http://www.quakelive.com/ (also available for Linux and Mac)
Half-Life 2: Deathmatch
Half-Life 2: DM is a fast multiplayer first-person shooter where you can also throw objects with gravity gun. Half-Life 2: Deathmatch is only free for ATI and NVIDIA graphics card users.System requirements: 1.2 GHz processor, 256MB RAM, DirectX 7 level graphics card.
ATI , NVIDIA
F.E.A.R. Combat is a free stand-alone multiplayer component of F.E.A.R., the horror themed first-person shooter. You have to register a free CD-Key to join F.E.A.R. Combat.System requirements: 1.7 GHz Pentium 4, 512MB RAM, 64MB GeForce 4 Ti / Radeon 9000.
Wolfteam is a fast-paced MMOFPS with many special features - like ability to transform into a werewolf. Wolfteam has large assortment of modern weaponry and 7 game modes.System requirements: 1.4 GHz Pentium 4, 512MB RAM, GeForce 5700 or higher.
http://wolfteam.softnyx.net/ , http://wolfteam.aeriagames.com/
Xonotic is a free open source fast-paced first-person shooter that is direct successor of the Nexuiz Project. Xonotic features new physics, maps, player models and animations.System requirements: unknown, similar to Nexuiz.
http://www.xonotic.org/ (also available for Linux and Mac)
Mars War is a free-to-play Sci-Fi MMOFPS with huge maps that can contain hundreds of real players. Mars War has wide variety of robots, equipments and vehicles (tanks, spaceships).System requirements: Pentium IV 2.0 GHz, 1GB RAM, Geforce 6200 / Radeon 9550.
Nexuiz is a free fast-paced cross platform first-person shooter, which runs on DarkPlaces engine. Nexuiz also includes a relatively short single-player campaign with bots.System requirements: 1 GHz Pentium III or AMD Athlon, 512MB RAM, GeForce 2.
http://www.nexuiz.com/classic.php (also available for Linux and Mac)
Warsow is a multiplayer free FPS set in a cartoonish world. Warsow's gameplay focuses on fast movements and tricksjumps (such as bunny hopping, wall jumping, rocket jumping...).http://www.warsow.net/ (also available for Linux and Mac)
Alien Arena 2011
Alien Arena is a retro Sci-Fi multiplayer FPS based on the CRX engine. Alien Arena 2011 has wide set of fun and unique weapons, dozens of maps, various play types and accessories.System requirements: 1GHz CPU, 256MB RAM, OpenGL compatible graphics card.
http://red.planetarena.org/ (also available for Linux and Mac)
Celestial Impact is a team based multiplayer first-person shooter that takes place on asteroids floating in space. It features destructible world and ability to add terrain to the landscape.System requirements: 2 GHz CPU, 512MB RAM, 128MB GeForce 6000 series or equivalent.
World of Padman
World of Padman is a cartoony free FPS game set in the miniature world of Padman. WoP has over 23 richly detailed maps, each supporting up to seven different play modes.System requirements: 1 GHz CPU, 512MB RAM, 128MB OpenGL Video Card.
http://www.worldofpadman.com/ (also available for Linux and Mac)
Sauerbraten is a free first-person shooter similar to Quake. Sauerbraten features both single-player and multiplayer modes, it also includes a dynamic ingame level editor.System requirements: 733 MHz CPU, 128MB RAM, 32MB GeForce 2 MX.
http://www.sauerbraten.org/ (also available for Linux and Mac)
Tremulous is a free game that blends team-based FPS with real-time strategy elements. This shooter features two teams: humans and aliens, both teams can build in-game structures.System requirements: 800 MHz CPU, 256MB RAM, NVIDIA GeForce 4 / ATI Radeon 9200.
http://www.tremulous.net/ (also available for Linux and Mac)
OpenArena is a free open-source clone of Quake III Arena. The gameplay is basically identical to the shooter it's based on, even some Quake 3 mods work with OpenArena.System requirements: Pentium II 233 MHz, 64MB RAM, 16MB OpenGL video card.
http://openarena.ws/ (also available for Linux and Mac)
UberStrike is a free-to-play cross-platform online first-person shooter, available for both Mac and Windows PC. UberStrike is the world’s first browser-based MMOFPS.http://uberstrike.cmune.com/ (also available for Mac)
Red Alert: A Path Beyond
Red Alert: A Path Beyond is a first-person shooter based on classic real time strategy, Command & Conquer: Red Alert. This shooter is standalone and free to play.System requirements: 800 MHz CPU, 128MB RAM, 32MB DirectX 7 compatible video card.
Legions: Overdrive is a free Sci-Fi FPS based on cancelled project, Fallen Empire: Legions. Many gameplay elements in Legions: Overdrive are borrowed from the Tribes series.System requirements: 2.2 GHz Pentium 4, 512MB RAM, NVIDIA GeForce 6800 / 8400.
SCUD Storm is a freeware game that turns Command and Conquer: Generals - Zero Hour into a 3D first-person shooter. SCUD Storm is standalone, you don't need any game to play this.http://www.moddb.com/games/scud-storm
Starsiege: Tribes is a multiplayer Sci-Fi first-person shooter with no single-player campaign. It was released for free to promote the release of Tribes: Vengeance, the upcoming sequel.System requirements: Pentium 166 MHz, 32MB RAM, 3D graphics accelerator.
Tribes 2 is a sequel to Starsiege: Tribes, set in the year 3941. Tribes 2 is a completely free to download multiplayer first/third-person shooter that takes place in fictional Earthsiege universe.System requirements: Pentium II 500 MHz, 64MB RAM, 12MB video card.
Legends is a fast-paced freeware online first-person shooter with jetpacks, similar to Tribes. This shooter also has mission editor and terrain generator integrated into the game engine.http://legendsthegame.net/ (also available for Linux)
Galacticwar is a free Sci-Fi first-person shooter that features both single-player and multiplayer modes. Galacticwar (GCW) will have single-player campaign and vehicles in the future.http://www.moddb.com/games/galacticwar
Daikatana Deathmatch is a free and non-profit fan made multiplayer modification of Daikatana. This modification is multiplayer only and have all single-player maps removed.Minimum requirements: Pentium 233, 32MB RAM, 4MB OpenGL compliant video card.
Transfusion is a free to download online first-person shooter that aims to be a total remake of Monolith's Blood. This multiplayer only shooter is based on the DarkPlaces engine.http://www.transfusion-game.com/ (also available for Linux)
Control Monger is a free Sci-Fi first-person shooter in which you take control of a robot. Control Monger features seven player types and support for LAN play.System requirements: 1.5 GHz CPU, 256MB RAM, 3D capable card 64MB video card.