Half-Life: Opposing Force is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life. The game was developed by Gearbox Software and published by Sierra Entertainment on November 1, 1999. Opposing Force is the first expansion for Half-Life and was first announced in April 1999. Randy Pitchford, the lead designer on the game, later noted that he believed Gearbox was selected to develop Opposing Force because Valve wanted to concentrate on their future projects. Over the course of development, Gearbox brought in a variety of outside talent from other areas of the video games industry to help bolster various aspects of design. Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S. Marine, one of the enemy characters in the original game. The player character, Adrian Shephard.

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Epic huge props pack for goldsource!

Epic huge props pack for goldsource!

Jul 14, 2015 Models Pack public domain licence (84.62mb) 1 comment

(I do not own any of this, i just modified some of them) I hope this helps goldsource developers, but know that you can't use this for commercial purposes...

Paul Blart Mall Cop reskin for Otis

Paul Blart Mall Cop reskin for Otis

May 28, 2015 Animal Model proprietary licence (0.26mb) 1 comment

Have you ever wanted to fight alongside Paul Blart in Black Mesa? Me neither. But here it is.

Half-Life: Further Data + dm_office

Half-Life: Further Data + dm_office

Feb 22, 2015 Multiplayer Map proprietary licence (5.00mb) 5 comments

Disclaimer: I take no credit for developing this addon or putting it on the internet. All credit goes to Valve, Gearbox, and Ryan Finnie. I am only placing...

OP4 DeamonD Pack

OP4 DeamonD Pack

Jan 29, 2015 Models Pack proprietary licence (10.37mb) 1 comment

This is the DeamonD version for Opposing Force. See description for details.

Hev charger & health charger from Half-life Decay

Hev charger & health charger from Half-life Decay

Sep 14, 2014 Prop Model public domain licence (0.09mb) 7 comments

those 2 models with they're animations, they're not made by me, they have animations and a retexture could make them look better, but im not going to...

Gold Source Anthology Add On Content Pack

Gold Source Anthology Add On Content Pack

Aug 2, 2014 Multiplayer Map proprietary licence (1,503.68mb) 0 comments

This Pack Contains Multiplayer Map Packs, SDK Tool Kits & Game Fixes.

Mission Impossible

Mission Impossible

Jul 24, 2014 Singleplayer Map proprietary licence (2.55mb) 0 comments

(note: there is a black screen for about a minute in the begginning, just wait it out) This is a 4 map mod that can be started by opening up the console...

Mechanized Death: Army of None

Mechanized Death: Army of None

Jul 24, 2014 Singleplayer Map proprietary licence (2.19mb) 0 comments

4 maps. Hey, don't blame me. They're great maps right up until Half-Life loads them. I'm not a programmer or anything but I'm pretty sure there's an actual...

Snow Rock

Snow Rock

Jul 24, 2014 Singleplayer Map proprietary licence (5.09mb) 0 comments

Snow Rock Part 1 is a total of 7 maps made by a veteran russian mapper. Extract all files in your Gearbox mainfolder. (half-life/gearbox/) Start Opposing...

Space Disaster

Space Disaster

Jul 24, 2014 Singleplayer Map proprietary licence (1.60mb) 0 comments

Space Disaster Part 1, is a short 3 map mod that can be started by opening up the console with ~ and typing map space1.

Source For Go-Mod 3

Source For Go-Mod 3

May 20, 2014 Skin Pack proprietary licence (43.54mb) 2 comments

This Is A Small Conversion Mod/Pack For Go - Mod 3.4 Or It Can Be Used In Half Life And Its Expantions This Mod Contains Models And Sounds From HL2 And...

OpposingForceMaps3

OpposingForceMaps3

Apr 13, 2014 Singleplayer Map proprietary licence (37.33mb) 0 comments

Without Doubts, Snowy Rock, Fallback (Peter Lok), Aliens, Warzone, Foothold, Mechanized Death: An Army of None.

OpposingForceMaps2

OpposingForceMaps2

Apr 9, 2014 Singleplayer Map proprietary licence (112.43mb) 0 comments

Black Bag Operations, Fallen Chaper, Bomb Squad, Corruption, Ep_rst1, Ground Zero, Ground Zero 2, Klabautermann, Mission Impossible, Red Area, Without...

OpposingForceMaps

OpposingForceMaps

Apr 9, 2014 Singleplayer Map proprietary licence (5.09mb) 0 comments

OpposingForceMaps: Ivy, Friendly Fire, Battle, Firing Range, Scientist Rescue, J2000, Little Escape, Underhalls, You Die, Postal, Sandblast, Zombies...

2bases 1.3

2bases 1.3

Apr 5, 2014 Multiplayer Map gpl licence (1.78mb) 1 comment

2bases is a simple Black Mesa like map for Scientist Hunt, Opposing Force, and Team Fortress Classic. It's a small map fit for 6 players or more and takes...

Floating City OP4 Edition *EXPANDED EDITION*

Floating City OP4 Edition *EXPANDED EDITION*

Mar 30, 2014 Multiplayer Map creative commons licence (0.21mb) 0 comments

My first Multiplayer map ported to OP4 *Desc from original* Inspired by a map featured on twhl.info My first multiplayer map that I've released in all...

Prefabs Pack

Prefabs Pack

Dec 30, 2013 Prefabs proprietary licence (4.88mb) 1 comment

A large zip file containing all prefabs downloaded from the Prefab Lab (the site has been shut down in 05-10-2002) since 5/1/1999. This pack contains...

Operation Sandblast

Operation Sandblast

Dec 19, 2013 Singleplayer Map proprietary licence (0.80mb) 2 comments

The creator goes by the same name here on moddb. This map was made immediately after completing Rumble, for the Best Train Ride Contest at the Valve ERC...

Beta Zombie Recreation

Beta Zombie Recreation

Nov 6, 2013 Animal Model proprietary licence (0.25mb) 0 comments

I took the dreamcast zombie, edited the textures and resized and shaped the model to replicate the one from the beta.

Later Alpha MP5 Replica

Later Alpha MP5 Replica

Nov 4, 2013 Weapons Model proprietary licence (0.04mb) 2 comments

My attempt at a late alpha mp5. Comes with sound, real model, and textures. Extract v_9mmar.mdl to models folder, and hks1,hks2,hks3 in the sound/weapons...

Half-Life Collection Golden Definition Pack

Half-Life Collection Golden Definition Pack

Sep 5, 2013 Models Pack proprietary licence (398.54mb) 17 comments

Half-Life Collection Golden Definition Pack 1.0 enhance the Golden Source models and solve some problems. For more details check the media section. Half-Life...

CenBlas - HL1OF

CenBlas - HL1OF

Apr 29, 2013 Language Sounds public domain licence (0.12mb) 0 comments

Removes verbal blasphemy Place the folder in the installed folder. Should be SteamApps\Opposing Force.

Umbrella Team v_1

Umbrella Team v_1

Feb 18, 2013 Animal Skin proprietary licence (3.82mb) 0 comments

By TiToOmg para todos y todas. Usted disfrutara esto como yo al hacerlo espero que le guste de Argentina al Word. PD: Próximamente un mod

Valve Hammer Editor 3.4

Valve Hammer Editor 3.4

Dec 29, 2012 Singleplayer Map proprietary licence (2.04mb) 6 comments

With this program you can make your own half-life maps,or edit

New Massn

New Massn

Nov 11, 2012 Players Model creative commons licence (5.65mb) 2 comments

Here is a model I made six bloody years ago and never found somebody to texture it. That was until last week when Swaggletooth was nice enough to make...

Gonome

Gonome

Aug 10, 2012 Animal Model proprietary licence (0.80mb) 3 comments

The gonome found on the case closed pack of trusty crowbar. It works for opposing force.

Small Models Pack

Small Models Pack

Feb 25, 2012 Models Pack proprietary licence (0.10mb) 4 comments

This updates the corresponding ammoboxes that they are named. This also comes with a whole new model.

Ultimate Half life model pack - Updated 7/31/2012

Ultimate Half life model pack - Updated 7/31/2012

Feb 6, 2012 Models Pack public domain licence (209.60mb) 61 comments

A collection of some the best half life replacement models (Blue Shift,and Opposing force also) for the single and multiplayer games while trying to keep...

Streetlevel(Remake) - Ports

Streetlevel(Remake) - Ports

Feb 6, 2012 Multiplayer Map public domain licence (24.97mb) 0 comments

One cold night in the year of 1999, down in the slums...

2bases - OP4CTF and TFC

2bases - OP4CTF and TFC

Sep 5, 2011 Multiplayer Map proprietary licence (3.25mb) 2 comments

2bases is a simple Black Mesa like map for Scientist Hunt, Opposing Force, and Team Fortress Classic. It's a small map fit for 6 players or more and takes...

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Half-Life: Opposing Force
Platform
Windows
Developer
Gearbox Software
Engine
GoldSource
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Release Date
Released Oct 1999
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