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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.

Sign up to become part of the community!

Source and the Source SDK  Go to the Source Engine documentation index  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. GoldSrc and the Half-Life SDK  Go to the GoldSrc Engine (Half-Life SDK) documentation index  Source 2 Workshop Tools Counter-Strike 2 Workshop Tools  Go to the Counter-Strike 2 Workshop Tools documentation index  Dota 2 Workshop Tools  Go to the Dota 2 Workshop Tools documentation index  Half-Life: Alyx Workshop Tools  Go to the Half-Life: Alyx Workshop Tools documentation index  SteamVR Workshop Tools  Go to the SteamVR Workshop Tools documentation index

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. 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.