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Half-Life SDK

The Half-Life SDK provides the source code and tools for creating GoldSource engine mods. In 2013 updated source code was released to GitHub at https://github.com/ValveSoftware/halflife. The updated source code included updated engine API definitions and Linux and Mac support. In 2024 the code was updated again with the 25th anniversary update changes.

The Half-Life SDK 2.0 was released in May 2000 and added support for VGUI as well as providing the source code for game's AI.

The Valve-ERC forums were hosted by Chatbear at http://www.chatbear.com/unity2/9/unityhome with discussion about Spirit of Half-Life at http://www.chatbear.com/unity2/839/unityhome.

Third-Party Tools

Tool Use Link
hammertime Map creation tool https://github.com/Duude92/hammertime
Sledge Map creation tool https://logicandtrick.github.io/sledge/

List of Open Source Mods

Mod Source code
Adrenaline Gamer https://github.com/martinwebrant/agmod
Arrange Mode Rebirth https://github.com/JoelTroch/am_src_rebirth
Battlegrounds https://github.com/nekonomicon/BattleGrounds
Cold Ice https://github.com/solidi/coldice-remastered
https://github.com/solidi/hl-mods
Half-Life: Planck Epoch https://github.com/edgarbarney/halflife-planckepoch
Half-Life: Pro https://github.com/solidi/hl-mods
Half-Life: Rally https://gitlab.com/hlrally/src
Paranoia https://github.com/a1batross/Paranoia2_ancient
https://github.com/a1batross/Paranoia2_original