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.
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 |