Games similar to Aliens Fireteam Elite include Doom. It's paid, but Alien Swarm is free. Other options are Shadow Warrior (Reboot), Prodeus, Dead Space and Killing Floor Mod. In total there are six First-Person Shooters like Aliens Fireteam Elite for Windows, Linux and Mac.
Doom is a science fiction horror-themed first-person shooter video game in which players assume the role of a space marine, popularly known as "Doomguy", who must fight his way through the hordes of invading demons from Hell.
United States
Shadow Warrior is a series of first-person shooter video games that focuses on the exploits of Lo Wang, a modern ninja warrior who fights through hordes of demons.
Poland
EU
Prodeus is a first-person shooter of old, re-imagined using modern rendering techniques and technology. Experience the quality you’d expect from a modern AAA game, designed with retro aesthetics and gameplay that invoke the tech-imposed limits of older hardware.
Canada
Dead Space is a survival horror third-person shooter video game for Microsoft Windows, PlayStation 3 and Xbox 360.
United States
Alien Swarm is a free top-down shoot-em-up video game by Valve Corporation. It is a remake of the Alien Swarm mod for Unreal Tournament 2004, and it was developed by the original team, which was hired by Valve during the course of the development process.
United States
Killing Floor is a "Total Conversion" mod for game. Playing as a squad of marines, you must use firepower and teamwork to drive back massive hordes of bloodthirsty zombies.
