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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 The Dota 2 Workshop Tools is a set of software utilities available as a free download for Dota 2 that allow you to create items for inclusion in the Dota store and the Steam Workshop and your own custom game modes (called addons). SteamVR Workshop Tools Go to the SteamVR Workshop Tools documentation index SteamVR Workshop Tools lets you create and share different environments for SteamVR Home: photogrammetry scenes, game worlds, or anything else that can be represented by a 3D model. 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