User Interface Kit – Monolith (Preview of Software Documentation)

The Source SDK is freely available to all Steam users. It is used to develop mods and content for the Source 2006, Source 2007 and Source 2013 engine branches.

About Source · Download and Installation · Frequently Asked Questions · Release Notes

Team Fortress 2

Portal 2

Modding Creating, organizing and releasing your Source project.

Level Design Maps are the 3D worlds where everything comes together.

Modeling Models are the detailed 3D objects that appear in the game world.

Materials Textures and shaders are combined in Source to create materials.

Sounds Quality audio adds a fourth dimension to your world.

Particles Effects like smoke, sparks, blood and fire are created with particles.

Programming A mod's C++ code defines the way its world and game rules behave.

Scripting Scripting can be used for adding new functionality or logic to entities.

I/O System The I/O system is the backbone of most levels in Source-based games/mods.

Choreography Direct your digital actors' performances with choreographed scenes.

Filmmaker Create movies inside the Source Engine.

Tutorials Step-by-step guides on a variety of topics.

Technical In-depth discussion on the Source Engine's features.

Glossary Explanations for terms you may encounter.

Official Tools Official tools made by Valve for their games.

Third-Party Tools Useful developer tools created by the community.