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13,094 articles documenting the development process.

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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:

• Dota 2 Workshop Tools 

• SteamVR Workshop Tools 

• Half-Life: Alyx Workshop Tools 

• Counter-Strike 2 Workshop Tools 

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.

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If you're interested in building a product using Source or Source 2, talk to us about options for distribution on Steam.

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.

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