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Todo: Add links to applicable TWHL Wiki pages on various GoldSrc pages, such as entity pages, as that wiki is more up-to-date and verbose for GoldSrc content.

The Half-Life SDK is the set of tools needed to create content for GoldSrc. On 30th August 2013, the Half-Life SDK was finally added to Steam in the 'Tools' section. You can now create and compile Half-Life and other GoldSrc mods for Windows, macOS and Linux as a result of the SteamPipe updates.

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

Modding	Creating, organizing and releasing your GoldSrc project.
Level Design	Maps are the 3D worlds where everything comes together.
Programming	A mod's C++ code defines the way its world and game rules behave.
Modeling	Models are the detailed 3D objects that appear in the game world.
Textures	Textures are used to add additional 2-dimensional detail to a map or model.
Sounds	Quality audio adds a fourth dimension to your world.
Sprites	Effects like smoke, sparks, blood and fire are created with sprites.
Tutorials	Step-by-step guides on a variety of topics.
Technical	In-depth discussion on the GoldSrc 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.