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
BSPViewer	Map viewer	https://github.com/SamVanheer/BSPViewer
HalfLifeAssetManager	Model viewer	https://github.com/SamVanheer/HalfLifeAssetManager
hammertime	Map creation tool	https://github.com/Duude92/hammertime
hlfix	.rmf to .map converter	https://github.com/kriswema/hlfix
Sledge	Map creation tool	https://logicandtrick.github.io/sledge/

List of Open Source Mods

Mod	Source code
Adrenaline Gamer	https://github.com/martinwebrant/agmod
Advanced Development Mod	https://github.com/Admer456/halflife-adm-legacy
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
Half-Life: Updated	https://github.com/twhl-community/halflife-updated
Master Sword	https://github.com/BerntA/MasterSwordClassic https://github.com/2cwldys/MSC-Source https://github.com/Xaymar/hl1-mastersword https://github.com/MSRevive/MasterSwordRebirth
Paranoia	https://github.com/a1batross/Paranoia2_ancient https://github.com/a1batross/Paranoia2_original
Seven Kewp	https://github.com/wootguy/SevenKewp
Wizard Wars	https://github.com/2cwldys/wizard-wars
Zombie Panic!	https://github.com/Monochrome-Inc/ZombiePanic-HL

Half-Life Mods

Master Sword

Master Sword is a mod that has existed since at least 2003. It has been through numerous iteraction including Master Sword: Continued and the current Master Sword: Rebirth which is intended to be released on Steam. Its homepage has been at http://www.Mastersword.flagrun.net, http://www.alaska.net/~articape/MS/index.html, http://www.daragoth.tk and http://www.master-sword.tk in the past.