An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility.

Add mod Mods  (0 - 30 of 43)
StormDrift

StormDrift

First Person Shooter

Total Conversion of the source engine, with deferred lighting. This mod/game is under heavy development and a lot of news is coming this week

Alien Frenzy

Alien Frenzy

Real Time Strategy

The year is 2026. The earth has been mostly destroyed by sunflares after the alien invasion. It seems their planet was destroyed first. The aliens came...

Omnibus

Omnibus

Arcade

Warhammer 40k mod for Alien Swarm. You play as one of four members in a Space Marine squad and you're sent to a Tyranid infected planet to investigate

Phobos Incident

Phobos Incident

Third Person Shooter

Phobos Incident is going to be a full-fledged campaign for Alien Swarm. It can be considered as a re-imagining or an alternate future for the base that...

Alien Swarm: The Darkness

Alien Swarm: The Darkness

Tactical Shooter

The Darkness is a mod designed to put the players into a much more difficult position than that of the original Alien Swarm, by removing a lot of lighting...

SourceForts 2

SourceForts 2

First Person Shooter

Redefine the environment around you. SourceForts 2 is a FPS game designed around building your base and battling against the opposing team in order to...

Apocalypse-22

Apocalypse-22

First Person Shooter

Apocalypse cuenta la historia de Abigaíl, una mujer de 28 años de edad en un futuro apocalíptico y sin memorias de su pasado. (Historia en desarrollo)

The Survival

The Survival

First Person Shooter

The Survival is an episodic Source Engine total conversion mod with an original storyline and unique cast of characters. Play your way through a post-apocalyptic...

Infestation

Infestation

Third Person Shooter

Lots more details in latest news post, looking for more team members too - if you feel you have something you could add to the mod send me a pm for a...

Lylat's Last Stand

Lylat's Last Stand

Third Person Shooter

SFR (WIP title) is a mod for the Source Engine. It's based on the 3d shooter game Starfox. It will be mostly based on the 1993 nintendo power comics...

ALIENS

ALIENS

Tactical Shooter

A mod for Alien Swarm that is based on the ALIENS movie but for a set of new marines to go and investigate LV426 and see what happened there! (This is...

Zombie Swarm.

Zombie Swarm.

Third Person Shooter

Greetings, members of ModDB. My name is Kenny, and I am currently the sole team member of the Zombie Swarm team. I originally started this project in...

Uprise

Uprise

First Person Shooter

The Resistance have mobilized agaisnt the Combine, causing the streets of City 17 to be turned into a warzone. Fight for the Resistance as a Rebel or...

Vectronic

Vectronic

Puzzle

Vectronic is a first-person environmental puzzle mod using Valve's Source Engine. Players must solve puzzles using special power balls that effect boxes...

Modular Combat 2

Modular Combat 2

First Person Shooter

Modular Combat 2 is an upcoming role-playing shooter based in the Half-Life universe. The game will feature upgraded graphics with custom shaders, AI...

Optic

Optic

First Person Shooter

Optic is a team-based multiplayer shooter where players can take the role of either a fast-moving runner or a slow-moving hunter.

ALIEN SWARM FP

ALIEN SWARM FP

First Person Shooter

This is a first person view modification of "Alien Swarm"

B.R.I.S.k.

B.R.I.S.k.

Arcade

B.R.I.S.k. is a game with unique gameplay developed by a team «Two On The One Box», which has created a modification for the game Portal 2 - Afterword...

Lights

Lights

Cinematic

Once you find the light, nothing can defeat you...

Brawlers

Brawlers

Third Person Shooter

After the dust had settled from the worlds greatest war, stockpiles of defunct weapons and ammunitions around Europe were scheduled for destruction. Private...

Reality Arms MOD

Reality Arms MOD

Third Person Shooter

A material and icon MOD which replaces the original resource.

Marine retexture

Marine retexture

Third Person Shooter

this addon makes the marines look more dirty & the sarge has a camo now,

Enhanced Interstella Armed Forces

Enhanced Interstella Armed Forces

Third Person Shooter

A new MOD based on Alien Swarm 2011 version. It is an independent game that does not need a installed Alien Swarm. Many data about marines and equipments...

Serious Swarm Marines

Serious Swarm Marines

Third Person Shooter

There new mod for Alien Swarm, with new models and other changes.

Chaos Swarm Marines

Chaos Swarm Marines

Third Person Shooter

There new mod for Alien Swarm, so on release we have new models and custom particles. More new portraits and other changes.

Space Swarm Marines

Space Swarm Marines

Third Person Shooter

New mod Space Marines for Alien Swarm. :)

Tron Swarm

Tron Swarm

Third Person Shooter

New custom models from Tron Revolution for Alien Swarm.

Alien Swarm:Silencer Mod

Alien Swarm:Silencer Mod

Third Person Shooter

Do you think the aliens are deaf?Unfortunately,they have perfect hearing ability.In another word,the huge noice comes from your weapons can attract the...

Swarm Director 2

Swarm Director 2

Third Person Shooter

Alien Swarm with a twist. Better AI, new mutations, new mapper tools.

Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop

Arcade

Adds new PvP game modes, co-op features and singleplayer support into Alien Swarm without changing its concept.