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Welcome to the Valve Developer Community. 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. It's free to join, and open to anyone working with the Source Engine and the Source SDK.

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Valve Technology


The engine under the hood of Half-Life 2 can make your game a success. Let Source™ do the heavy lifting so that your team can focus on building great games.


If you're interested in building a product using Source, talk to us about options for distribution on Steam.

Source and the Source SDK

Our knowledgebase of technical information about using the engine and all of the related tools is now posted on a community-driven web site called a wiki. Sign up as a developer to contribute or to ask a question.

For Mod Teams


Latest News

Source SDK Update
Wed Oct 19th, 2011
The Source SDK is has been updated.

VDC Site Update
Monday Jun 27th, 2011
The site has gone through a software upgrade and a new look. Read more about the improvements on the Release Notes page.

Source SDK Update
Tue May 11th, 2010
A new version of the Source SDK is now available.

VDC Site Update
Thursday Jun 18th, 2009
The site has gone through a software upgrade. Read more about the improvements on the Release Notes page.

A New and Improved VDC!
Thursday, Jan 15, 2009
The site has gone through a major upgrade with many new editing features! Read more about the changes on the Release Notes page.

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