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Whether you're building 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.
GoldSrc and the Half-Life SDK 
If you want to create a Mod for Half-Life or looking for more GoldSrc documentation, click above.
Source and the Source SDK
If you want to create a Mod for Half-Life 2 or looking for more Source documentation, click above.
Source 2 Documentation
If you want to port Source content to Source 2 or looking for more Source 2 documentation, click above. Otherwise, you can check out the following Source 2 games with Workshop Tools:
- 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.
For help with using the wiki, see Help:Contents. For help with navigating the wiki, see Category:Entry pages or Category:Valve Developer Community. For more information on the community itself, see Community Portal.