Strider Mountain is a single player mod for Half-Life 2. The mod features new weapons, textures, models, voice acting and plenty of action.

Ten Four is a well known single player review site that covers a few different games. They present 3 levels of awards for the better releases and the forum, whilst not as busy as they used to be, is still a place to find the latest releases.

The Half-Life Saga Story Guide was created in order to provide a concise, accurate, user-friendly overview of the events dealing directly with the events of the Half-Life Saga, and allowing users to easily get a better understanding of the story behind the games. It was written by Chan Karunamuni, with lots of help from contributions [...]

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

The Snarkpit has been online since 2001, making it one of the longest running websites that covers Valve’s games. It has had a number of redesigns over the years and always adds new features.

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

The Whole Half-Life AKA TWHL is first and foremost a community of mappers and modders. It has very active forums and plenty of tutorials.

TotalHL.hu is a Hungarian Half-Life portal.

Tweak Guides provides incredibly useful information and tips on how to get the most out of your hardware and games.

Whether you’re building a “Triple-A” commercial project or a mod for Half-Life® 2 , you’ll want to sign up as a Valve developer today.

Valve-ERC Forums is a forum for mapping and modding, focusing on Source and GoldSource issues. The Half-Life 2/Source section is outdated because it moved to a sub-forum of the SteamPowered forums.