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)
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.

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,

Hypovolemia

Hypovolemia

Third Person Shooter

HYP is real time tactical shooter with chess like awareness and high skill ceiling. The game focuses on intricate game design while offering a unique...

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.

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.

Lambda Wars

Lambda Wars

Real Time Strategy

Lambda Wars (formerly Half-Life 2: Wars) brings the struggle between the human resistance and their Combine overlords to a multiplayer real-time strategy...

Swarm Director 2

Swarm Director 2

Third Person Shooter

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

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.

Black Mesa Swarm

Black Mesa Swarm

First Person Shooter

Black Mesa Swarm is an Alien Swarm total conversion remaking Valve Software's award-winning PC game, Half-Life.

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...

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)

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...

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...

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...

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 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...

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...

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...

ALIEN SWARM FP

ALIEN SWARM FP

First Person Shooter

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

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...

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...

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...

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...

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...

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...

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...