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)
Infested Office

Infested Office

Third Person Shooter

A test of skill and teamwork, this addon/map pack challenges you and your team even on the easier difficulty settings.

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...

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...

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

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...

Alien Haunt

Alien Haunt

Adventure

Alien Haunt. A Map for Alien Swarm. 1 Campaign with 5 maps. Get ready to be swarmed by aliens!

Alien Swarm Aliens Mod

Alien Swarm Aliens Mod

Tactical Shooter

this "mod" will replace weapon's data and sounds for alien swarm making it feel like Aliens. Furthermore, maps will be made for this mod and the final...

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...

Alien Swarm SDK Template Conversion

Alien Swarm SDK Template Conversion

First Person Shooter

C_b_fofep and I decided to convert the Alien Swarm build back into an FPS source engine version. This takes the orange box or the SDK template code and...

IAF Weapon Drop

IAF Weapon Drop

Third Person Shooter

Almost all weapons were modified more or less noticeable. Some of them are big changes (like semi-auto Railguns and Sniper Rifles or Miniguns with lot...

Lights

Lights

Cinematic

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

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

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...

ASB²  mod

ASB² mod

Tactical Shooter

ASB² mode (alien swarm beyond brutal) is a reborn ASBi game mode emphasizing the higher degree of difficulty, which includes the invalidity of such options...

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...

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...

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...

Swarm Keeper

Swarm Keeper

Real Time Strategy

Swarm Keeper is a Dungeon Keeper inspired modification for Alien Swarm. It offers the following features: Build a dungeon for your creatures (aliens...

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...

Alien Swarm:SP

Alien Swarm:SP

Third Person Shooter

Play the official Alien Swarm maps and any addons through the Offline Practice mode. Alien Swarm:SP also supports a large amount of configurable changes...

ALIEN SWARM FP

ALIEN SWARM FP

First Person Shooter

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

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...

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...

Alien Swarm Director Mod

Alien Swarm Director Mod

Third Person Shooter

Welcome to the Alien Swarm Director Mod! ASDM is a single player Alien Swarm mod focusing on increasing replayability by creating a dynamic experience...

Alien Swarm: Rifle Mod

Alien Swarm: Rifle Mod

Arcade

Rifle Mod is an Alien Swarm server-only mod that forces players to play with assault rifles only, harder aliens, more ammo, smarter bots. However rifle...

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...

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...

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...