SDK Docs

General

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Modding	How to create a Source mod.
Level Design	Maps are the cornerstone of Source, where it all comes together. Learn about all aspects of producing them here.
Choreography (FacePoser)	Make Source's characters come to life with its uniquely powerful choreography technologies.
AI	AI controls the behaviour of all but the simplest of NPC actions and Source makes using or creating it easy.
Material System	Textures and shaders are combined in Source to create materials.
Sound System	Documentation on Source's software sound system.
Modeling	Everything you need to know about modeling for Source.
VGUI	Valve's proprietary GUI mimicks Windows' and works both in-game and on the desktop. Used for interfaces, HUDs, and dynamic displays in the 3D game environment. If you want to display information VGUI is the answer.
Programming	The nuts and bolts of any MOD, programming is what makes things different.
Tutorials	Need help trying to use a particular Source feature? Check here.
Technical	Miscellaneous technical aspects about the Source engine and Half-Life 2 programming.
Glossary	What's this mean? What's that mean? Look here!
Third Party Tools	Non-Valve developer tools