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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 knowledgebase 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. Dota 2 Workshop Tools Go to the Dota 2 Workshop Tools documentation index Now in a Beta test release, the Dota 2 Workshop Tools can be used by developers to create and test custom game modes for Dota 2. For Mod Teams 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.

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