Games like Alien Swarm on Steam
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Countersnipe
Multiplayer Seek and Snipe
SCP: Escape Together
In the midst of a site-wide containment breach, you must team up with other Class-D personnel to escape the underground, isolated facility while evading the dangerous anomalies that have breached containment.
Black Squad
Black Squad is a free-to-play military first-person-shooter. Players can master their skills and show off their strategies with a wide range of game maps, modes, and weapons to choose from. Join thousands of FPS players worldwide in one of the most played games on Steam!
FPS Game: Dev Test
A Simple, Fun, Multiplayer FPS game, strictly built and packaged for development testing and networking development.
Double Action: Boogaloo
Double Action is a free stylish multiplayer game about diving, flipping, and sliding your way into action movie mayhem.
pla_toon
pla_toon is an action-packed, first-and-third-person, multiplayer, light-hearted, cartoon-style shooter where you as play a soldier. Join the multiplayer battle and be the first to a para-crate drop to equip your player with powerful weapons! Or get on an ostrich and ride off into the sunset...
Formicide
Formicide is a fast-paced 2D online platformer with a lineup of versatile classes. Think Worms meets Team Fortress 2. Face off with teammates against enemies in destructible environments with the weapons and abilities at your disposal.
Spectre Divide
Spectre Divide is the genre-evolving, free-to-play 3v3 tactical shooter driven by Duality. Use Duality to control two bodies in real-time, letting you defend two sites at once, cover your own cross, or even trade yourself. Master tactical gunplay and an arsenal of future tech to achieve infamy.
Stars End
Stars End is a sci-fi survival sandbox set on the wild frontier of a distant star system. Play solo or host your own server as you craft, build, and battle to survive in a galaxy shaped by danger, discovery, and your own grit.
ONE PIECE Bounty Rush
Take the loot, pirates! Bounty Rush is a 4 vs 4 multiplayer team action game. Work with your team to capture the other teams' berries!
The Expendabros
The Expendabros have assembled and set their sights on the forces of ruthless arms dealer Conrad Stonebanks in the forests of Eastern Europe.
Yet Another Zombie Defense
Darkness is coming. How long can YOU survive? Build your base by day, defend it by night. Play in online or local co-op. Stay alive as long as you can.
This Means Warp
It’s co-op space survival fun, Jim, but not as we know it. This Means Warp is an intense spaceship management roguelite experience for 1-4 players. Explore a procedurally generated universe, upgrade your ship, battle dangerous enemies and adapt your strategies to survive in a hostile galaxy.
MechWarrior Online™ Legends
MechWarrior Online™ Legends is a tactical, 'Mech-based online shooter set in the vast BattleTech Universe. Assume the role of an elite MechWarrior, piloting powerful BattleMechs, fighting for supremacy over the Inner Sphere.
ORION: Prelude
Work together to survive the devastating Dinosaur horde in huge, endless environments.
Serious Sam 3: BFE
Serious Sam 3: BFE is a prequel to the original indie fast action FPS and Game of the Year sensation - Serious Sam: The First Encounter!
Left 4 Dead 2
Set in the zombie apocalypse, Left 4 Dead 2 (L4D2) is the highly anticipated sequel to the award-winning Left 4 Dead, the #1 co-op game of 2008. This co-operative action horror FPS takes you and your friends through the cities, swamps and cemeteries of the Deep South, from Savannah to New Orleans across five expansive campaigns.
TOXIKK™
FRAG LIKE IT'S 1999! TOXIKK plays as if today's military shooters never existed: Designed as a spiritual successor to the FPS giants of the late 90s and early 2ks, TOXIKK carefully evolves their mechanics with modern technology and fresh ideas elaborated with Arena-FPS enthusiasts.
It Takes Two Friend's Pass
Download Friend's Pass* and play It Takes Two with a friend for free. Just grab a friend who owns the full game, download Friend's Pass for free, and play together!
STAR WARS™ Battlefront™ II
Be the hero in the ultimate STAR WARS™ battle fantasy with STAR WARS™ Battlefront™ II: Celebration Edition!
Deuterium Wars
Deuterium Wars is a rapid 2D shooter. Create your own aircraft and plunge into heated battle with other players. What awaits you: an extensive role-playing system, craft, trading, and much more on a single server for all platforms.