Aleph One is an Open Source 3D first-person shooter game based on the game Marathon 2 by Bungie Software. It is set in a Sci-Fi universe dominated by deviant computer AIs and features a well-thought-out plot.

AssaultCube is an exhilarating multiplayer, first-person shooter based on the CUBE engine. AssaultCube Reloaded also available.

AssaultCube Reloaded is a free, multiplayer, first-person shooter game, based on the CUBE engine.

Bitsturbed is an old-school, action-driven, sci-fi, single-player first-person shooter.

Black Fps is a first-person shooter game in which you are a futuristic trooper tasked with searching through various buildings and eliminating enemy mercenaries.

Black Ice is a cyberpunk first person shooter (FPS) with strong RPG elements. Think Borderlands meets Tron.

CellFactor: Revolution is a first-person shooter released on May 8, 2007, designed to show off the capabilities of the Ageia line of PhysX cards.

In Christmas Night Of Horror, you have to find seven gifts and save seven Santas from demonic characters like Slenderman and one that looks a lot like Eddie from Iron Maiden - you must save Christmas.

CoronaKO is a 3D game that lets you eliminate frustration on this pandemic by shooting and killing the virus - within 90 seconds.

This new Counter-Strike 1.6 fits all your needs - nice design, supports Windows XP, Vista, 7 and 8. And its FREE.

Critical Annihilation is a simple shooter game where aliens are descending upon Earth in an attempt to wipe humankind out.

Cube 2: Sauerbraten is a free multiplayer & single-player first-person shooter, the Cube FPS's successor.

Dead Lab is a first person shooter where you find yourself trapped in a research lab where a virus has been released, and you need to escape.

Diabolical Nightmare is a series of three games designed to be dark, eerie, and full of action. Travel through multiple levels of eerie ambiance and kill all monsters in the level to advance to the next level.

Digital Paintball 3 is a first person shooter (FPS) game available on Web, PC, Mac and Linux.

The human race is on the verge of extinction! The new military launched a new special forces program to fight the new threat in the Survival First Person Shooter.

Frag Time is an indie developed first-person shooter with simple, cartoony graphics. The game has a familiar feel for anyone who played Doom and the early Quake games.

In Galaxy Guardian, you are the protector of the galaxy against throngs of hostile alien invaders bent on destruction and domination.

Gang Garrison 2 is a free multiplayer 'demake' of Valve's Team Fortress 2.

HAWKEN is a multiplayer first person shooter for PC that places you inside a mechanized war machine on the battlefield of a dystopian world called Illal. Requires the Steam client.

Hidden & Dangerous is about the beginning of the Special Air Service during World War II. You control a four-man squad of soldiers. It is a 3rd person/1st person, tactical action game.

Lost In The Deep Space has you, an astronaut, lost on a small planet, challenged to get as many crystals in the least amount of time.

MatriX.CoronaKO is a 3D sequel to CoronaKO, in which the viruses have infected your onboard computer and mutated into digital viruses, and you must now destroy them in the MatriX.

Mazeland is a first-person shooter game that immerses you in a strict procedural world where you have the option to fight against AI or other players and take back the city.

No More Room in Hell is a tribute to the film series No More Room in Hell. It's a co-operative realistic first person survival horror modification using the Source Engine.

Nyctophobia is a creepy, indie developed first-person shooter.

Operation Rabbit Assault is a single level FPS where you target and kill cartoon bunnies.

Paintball 2 features the fast-paced, arcade-style movement from first person shooters like Quake 2 in a Paintball game.

Paintball 3D is bot only; offline indie developed paintball game with a first-person perspective.

plaToon is a goofy cartoon style shooter that features an action-packed multiplayer, first, and third-person with many modes including Capture The Flag, biplanes, and of course - rideable ostriches.

A remake of the 1989 First Person Shooter of the same name by Dynamix and EA Games.

Psi-Ops: The Mindgate Conspiracy is a traditional shooter that uses ragdoll physics and a variety of psychic powers to differentiate itself.

Purge or PurgeFinal is a free first-person shooter computer game that combines futuristic and magical themes, based on the FvF purge game mode.

Ravenfield is a first person shooter indie game with ragdoll physics where you and your blue allies need to destroy the opposing red team with using helicopters, cars, and guns.

Red Eclipse is a fun-filled new take on the casual first person arena shooter, built as a total conversion of Cube Engine 2.

Risen3D is an advanced Doom port by Graham Jackson based on Jaakko Keranen's Doomsday port.

Savage 2: A Tortured Soul is the sequel to Savage: The Battle for Newerth, a fantasy and science fiction themed video game that combines elements of the first-person shooter, real-time strategy, and action role-playing game genres.

Savage: The Battle for Newerth is an FPS/RTS game initially released by S2 Games in September 2003 and eventually became freeware three years later in September 2006, when the game was officially abandoned and made open source. Savage 2: A Tortured Soul is also available for free.

Söldner Secret Wars Community Edition is a semi realistic Military Tactical Multiplayer Shooter using modern weapons and units

SCP - Containment Breach is a free, first-person horror survival game.

Shoot Your Nightmare Halloween Special is a first-person shooter where you need to collect 13 candy bowls to awaken from your nightmare.

Smokin' Guns is an open source, total conversion of id Software's Quake III Arena.

Star Warrior 2 - Defenders has you operating a gunship that has been tasked to defend against alien attacks and incoming meteorites.

The Esc4pe is an indie developed, self-titled, primitive first-person shooter that was created as a practical exercise for the Master in Video Game Development with Unity3D & 3DS Max Official Autodesk.

The Spy Who Shot Me is an indie developed retro FPS with puzzles, multiplayer, and more.

In Unturned you become a survivor in the zombie infested ruins of society, and team up with your friends to remain among the living.

Unvanquished is an Open Source first-person strategy shooter, pitting technologically advanced human soldiers against hordes of highly adaptable aliens.

War Rock was a tactical first-person shooter massively multiplayer online game with fast-paced gameplay where you will have to stay alive while fighting on land, sea or air. War Rock has been discontinued but we have plenty of other excellent First-Person Shooters for you to try.

Warsow is free, fast-paced first-person shooter set in a futuristic cartoonish world where rocketlauncher-wielding pigs and lasergun-carrying cyberpunks roam the streets.

Wolfenstein: Enemy Territory is one of the most popular free-to-play multiplayer shooters in the world.

Xonotic is a free and fast-paced first person shooter for Windows. It combines addictive, arena-style gameplay with rapid movement and a wide array of weapons.

Zero Ballistics is a unique blend of first-person shooter and tank combat, focusing on multiplayer gaming exclusively.

ZKILLER is a first-person shooter survival horror video game set in a zombie-apocalypse world featuring an advancement system, full-detailed environments, and unlockable weapon and levels.