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Welcome to the Valve Developer Community. Whether you're building a triple-A commercial project or a modification for Half-Life 2, you'll want to sign up as a Valve developer today. It's free to join and is open to anyone working with the Source engine and its software development kit.
Sign up to become part of the community!
Source and the Source SDK 
Our knowledge base of technical information about using the engine and all of the related tools is posted on a community-driven web site called a wiki. Sign up as a developer to contribute.
Source 2 Documentation 
Looking for Source 2 documentation in general? Visit the page by clicking on the button or the text above.
Otherwise, you can check out the following Source 2 games with its Workshop Tools below:
Counter-Strike 2 Workshop Tools 
Dota 2 Workshop Tools 
Half-Life: Alyx Workshop Tools 
SteamVR Workshop Tools 
Read about Valve Technology 
For Mod Teams
- Source Engine Features.
- Why choose the Source Engine for your mod?
- Read Making a Mod - building a team through the shipping process.
- Already using the SDK? Check the Source SDK FAQ for some helpful answers.
- New to Source coding? Get started with basic programming articles.
- Read (or add) a tutorial on Source development, or any part of the content creation process.
New to the wiki?
For help with using the wiki, see Help: Contents. For help with navigating the wiki, see Category: Entry pages or Category: Valve Developer Community.