Valve Community

Portal: Prelude, as its name states, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch, even before she was plugged in. At this time, test subjects were monitored by real Aperture Science employees whose work was tedious, lengthy and repetitive. This is why they decided to build a great artificial intelligence that could both replace them in these difficult tasks, but also take responsibility for many other tasks within the complex and compete with Black Mesa’s superiority. All employees of the Aperture Science complex are now eagerly awaiting GlaDOS. Maybe even a little too eagerly, as the upcoming events will tell…

Age Of Chivalry is a first person online medieval combat experience with a heavy focus on melee combat and objective-based team play.

Flesh is a single player Horror Mini-mod for the Half-Life 2 engine. “It features an engaging and deep storyline, while challenging the player with a variety of puzzles. One cannot fight, they can only run and hide.”

Half-Life Uplink is a website dedicated to Half-Life Uplink, which was released February 12, 1999, and is one of two demos released by Valve for the original Half-Life video game. The first was Half-Life: Day One and contained the first fifth of the full game, and was only included with certain video cards of the time. Half-Life: Uplink, on the other hand, was a standalone demo set in the Half-Life universe, and contained levels and a storyline not found in the full title.

Empires is a multiplayer Half-Life 2 mod combining first person shooter and real-time strategy.

The Hidden: Source is a multiplayer Half-Life 2 total conversion mod.

The Trenches: Fields Of Horror is a World War One modification for Half-Life 2.

CSPromod is an attempt to bring a fully-customizable version of Counter-Strike to the Source Engine for the purposes of growing competitive play and broadcast spectatorship.

Type 3 Studios is a “studio” and home of a couple of mods and a collection of tutorials.

Combine Destiny is the home of the Combine Destiny 1 and 2 mods for Half-Life 2.

The Cinematic Mod (CM) is a Half-Life 2 modification, that adds more details and a darker look to the original Half-Life 2 series.

Sven Co-Op is a co-operative mod for Half-Life 1. It allows players to play together to defeat the computer controlled enemies. It is possible to play through the original Half-Life game with friends and there are also hundreds of maps specifically designed for co-op play.