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

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.

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

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

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.

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

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.

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

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 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.

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

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

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.

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.

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.

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.

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

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

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.

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

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.

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

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.

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.