HL Sources

Half-Life SDK [ValveSoftware/halflife]

Original Half-Life SDK

halflife-updated [Solokiller/halflife-updated]

Half-Life SDK updated to compile under VS2019

HLEnhanced [Solokiller/HLEnhanced]

Half-Life Enhanced. Vanilla SDK with improvements. No longer maintained, will be replaced by SharpLife.

See also: HLEnhanced-Game

ReHLDS [dreamstalker/rehlds]

Reverse-engineered HLDS

Xash3D FWGS [FWGS/xash3d-fwgs]

Xash3D FWGS engine. Rebooted fork since big Xash3D 0.99(1.0 is not yet) update.

Xash3D @hlfx.ru

Original Xash3D engine

Xash3D-VS2019 [Magic-Nipples/Xash3D-VS2019]

Xash3D [build 4344] Converted to Visual Studio 2019 with other fixes and enhancements. http://www.xash3d.ru/doku.php?id=en:start

Xash3D FWGS (old) [FWGS/xash3d]

DEPRECATED in favor of https://github.com/FWGS/xash3d-fwgs. Only bugfixes are accepted. https://xash.su

hlsdk-xash3d [FWGS/hlsdk-xash3d]

Fork of patched Half-Life SDK 2.3 from original Xash3D engine

Xash3DS [masterfeizz/Xash3DS]

A port of Xash3D-FWGS for the Nintendo 3DS

vitaXash3D [fgsfdsfgs/vitaXash3D]

A port of Xash3D-FWGS to the PSVita

Half-LifeX [brentdc-nz/Half-LifeX]

A port of Half-Life 1 to the original Xbox console using Xash3D.

xash3d-switch [clamintus/xash3d-switch]

Updated version of xash3d-switch. Runs on latest firmware and AMS.

Adrenaline Gamer [martinwebrant/agmod]

Adrenaline Gamer Half-Life Mod

Afterburner [noodlecollie/afterburner-game]

Open-source reboot of 007 Nightfire.

Arrangemode: Rebirth [JoelTroch/am_src_rebirth]

Source code released in August 7th 2008 of the Half-Life 1 mod : ARRANGEMODE : REBIRTH

Battle Grounds [nekonomicon/BattleGrounds]

Set during the American revolutionary war, the Battle Grounds is a Half-Life Modification where you and your teammates will need to fight together strategically in order to overcome the enemy forces.

BubbleMod @bubblemod.org

This mod changes the standard Half-Life game to make it more challenging. The big damage weapons were weakened, and key things were changed to allow a more skillful game. The tau/grenade/RPG bind combo is easily countered. Some new weapon modes were introduced to expand teamplay.

Chicken Fortress 3 [CKFDevPowered/CKF3Alpha]

Half-Life mod that ported the Team Fortress 2 to GoldSRC engine

Cold Ice @moddb.com

Cold Ice is a Half-Life Deathmatch that changes all the weapons from the regular DM and replaces these with totally new weapons to make the game more enjoyable. p.s. probably one of the first multiplayer mod for Half-Life

Cthulhu [gunrunners-paradise/Cthulhu-HLmod-SDK]

This is the code for the Half-Life mod Cthulhu - Released by Phil G

GangWars [nekonomicon/gw1.45src]

GangWars Half-Life 1 Mod

Go-Mod @moddb.com

Go-Mod 2.0 source code. Go-Mod is a sandbox modification for Half-Life based on the popular Source Engine game Garry's Mod.

Half-Life: Absolute Zero @gitlab [Cobalt-57/half-life-absolute-zero]

Half-Life: Absolute Zero is a fan-made modification that re-creates the original ideas and plans from the award-winning classic: Half-Life.

Half-Life: Echoes @moddb.com

Half-Life: Echoes - Version 1.4 - Map files and source code.

Half-Life: Invasion [jlecorre/hlinvasion]

Source code for Half-Life: Invasion, a singleplayer Half-Life modification.

Half-Life: The Quest mod @yadi.sk

Half-Life: The Quest mod - mod with top-down perspective

Half-Payne [suXinjke/HalfPayne]

Half-Payne is a Half-Life mod that brings some gameplay bits from Max Payne, such as Slowmotion,
Diving move, Painkillers and custom game modes.

Half-Rats: Parasomnia [HeathGames/half_rats_parasomnia_src]

Source code for the Half-Life 1 modification: Half-Rats: Parasomnia.

Half-Screwed [desukuran/half-screwed]

Half-Screwed is a Half-life Modification where the tense serious multiplayer action is blown away with weird weapons and other great wonderful things

Half-Life: Top-Down @gitlab [Sockman/hltopdown]

The basic goal is to get Half-Life 1 fully playable as a top-down shooter.

Half-Life: Update [Fograin/hl-subsmod-ex]

Half-Life: Update MOD

Half-Quake Trilogy [muddasheep/hqtrilogy]

Half-Quake Trilogy

Half-Life: Weapon Edition @moddb.com

What can be a plot of a Multiplayer MOD? Meat, gore, death, destructions and once again meat! Destroy the opponents from more than 60 kinds of the weapon, and do not give them any chances of rescue. And let Game will define the strongest.

Half-Nuked @moddb.com

Duke Nukem weapons in Half-Life. Play as the king all over Black Mesa including in Dukematch.

Headcrab Frenzy! @moddb.com

New casual mod for Half-Life. You may play it on a local computer or give a challenge to your friends on public servers. Kill all those evil headcrabs! Get the highest score!

Ingram Chillin' Mod @sourceforge [icm-hl]

icm is an open-source half-life modification.

MechMod [vermagav/mechmod]

MechMod was a total conversion mod of Half-Life and was based on Mechs from the Gundam and Macross series.

Natural Selection [unknownworlds/NS]

Natural Selection mod for Half-life

Paranoia @moddb.com

Paranoia - it is a our single-player modification for Half-life. You will play the role of a russian officer of the secret service. Your first impressions are that this mission will be just like any other, but you really have no idea what nightmares future events have in store for you...

Paranoia 2 (2014 build) [a1batross/Paranoia2_ancient]

Early build of Paranoia 2 dated by 2014. Published by Unkle Mike in 2019. Repo contains source code only, full archive (~700MB) in releases

Raven City @ucoz.ru

About Raven City source code - unfinished mod for Half-Life

Spirit of Half-Life @moddb.com

Spirit of Half-Life (SoHL) is a modified game engine for Half-Life 1 modders that includes many new things not seen in the original Half-Life engine by Valve. This includes reflections, mirrors better lighting, weather like moving clouds, rain, snow, and fog. Physics capabilities like picking up objects and dropping them, or when some thing explodes objects go flying off in the direction.

Trinity Renderer @moddb.com

This is the source code for the last public version of the Trinity rendering engine, version 3.08f.

Tyrian: GroundAssault @moddb.com

Tyrian: Ground Assault (further TGA) is an Unreal Tournament and Quake style Half-Life 1 (goldsource engine) modification. TGA features Classic Deathmatch, Team deathmatch, Capture The Flag, Domination game rules, more than 50 new weapons, more than 20 different items and powerups, new hi-def models and lots of special particle effects.

Wizard Wars @thothie.com

Wizard Wars, one of the earliest Half-Life (HL1) mods, was made in the spirit of Team Fortress Classic - except, instead of modern soldiers, you battled with medieval magicians. Wizard Wars quickly evolved into an entirely different game, retaining only the most core aspects of its predecessor. Wild magical weapons of mass devastation and dragons were later added to complete the separation, but most of these were lost when WON died, and Half-Life switched to Steam.

XashXT [a1batross/XashXT_original]

Original Source Code of XashXT Toolkit. Beware! Repo is huge! Some parts are not opensourced yet, so I had to upload binaries here just for history.

Zombie-X [HLSources/Zombie-X]

Zombie-X Half-Life Mod 1.0 final. A Small singleplayer Mod. Some information: New Code. New Maps. New Weapons. New Monsters.

ZXCmod @moddb.com

Multiplayer mod Zxc by 291 (Blender.pro) for Half-Life 1 with free source code. Over 30 different weapons (including old), features and relatively high stability of the HLDS.

half-life-better-weapons [Solokiller/half-life-better-weapons]

Better weapons code for Half-Life

HLEnhanced-Game [Solokiller/HLEnhanced-Game]

Half-Life Enhanced game repository

See also: HLEnhanced

halflife-fog [Solokiller/halflife-fog]

Half-Life SDK with env_fog implemented

OpenAG [YaLTeR/OpenAG]

An open-source reimplementation of Adrenaline Gamer's client library.

Crack-Life: Campaign Mode [LostGamerHL/crack_life]

Crack-Life: Campaign Mode - Recreation by lostgamer aka nillerusr

Team Fortress Classic [Velaron/tf15-client]

Team Fortress 1.5 client (reverse-engineered)

halflife-op4 [Solokiller/halflife-op4]

Half-Life SDK with Opposing Force code

czeror-sdk [Solokiller/czeror-sdk]

Condition Zero Deleted Scenes SDK

ReGameDLL_CS [s1lentq/ReGameDLL_CS]

🔨 Reverse-engineered gamedll (CS 1.6 / CZero)

cs16-client [FWGS/cs16-client]

Counter-Strike 1.6 rewritten client.dll. Without VGUI, ParticleMan and ecology friendy.

CSMoE [MoeMod/CSMoE]

Cross-platform Counter-Strike mod based on Xash3D (previously named CSBTE-Mobile)

FreeHL [eukara/freehl]

Clean-room reimplementation of Half-Life: Deathmatch and Half-Life (Experimental) in QuakeC.

FreeCS [eukara/freecs]

Clean-room Counter-Strike 1.5 in QuakeC, using Nuclide SDK. Previously known as OpenCS! (2016)

FreeGearbox [eukara/freegearbox]

Clean-room reimplementation of Opposing Force in QuakeC.

FreeTFC [eukara/freetfc]

Clean-room reimplementation of Team Fortress Classic in QuakeC.

FreeSci [eukara/freesci]

Clean-room reimplementation of Scientist Hunt in QuakeC.

FreePoke646 [eukara/freepoke646]

Clean-room reimplementation of Poke646 in QuakeC.

FreeHunger [eukara/freehunger]

Clean-room reimplementation of They Hunger in QuakeC.

FreeGunman [eukara/freegunman]

Clean-room reimplementation of Gunman Chronicles in QuakeC.

Sandbot [tschumann/sandbot]

Sandbot is an open source multiplayer bot based on HPB Bot by Jeffrey 'botman' Broome. Sandbot aims to provide bots for various GoldSource engine games and mods. It currently supports: Half-Life, Opposing Force, Day of Defeat, Gunman Chronicles, Natural Selection, They Hunger

Parabot [nekonomicon/Parabot]

Crossplatform fork of parabot 0.91. Human-like artificial player for Half-Life and some other games on GoldSrc and Xash3D game engines.

jk_botti [Bots-United/jk_botti]

Bot (Computer AI) for Half-Life 1 Deathmatch

TrenchBroom [kduske/TrenchBroom]

Cross-Platform Level Editor http://kristianduske.com/trenchbroom

Sledge [LogicAndTrick/sledge]

An open source alternative to Valve's Hammer Editor for the Goldsource engine. (No longer in development)

Sledge-formats [LogicAndTrick/sledge-formats]

C# parsers and formats for Half-Life 1 and related engines.

HLView [LogicAndTrick/HLView]

A viewer for everything in your Half-Life game folder

VPKReader [QuakeTools/VPKReader]

parse valve's vpk file, and selectively extract files in it.

HLLib [RavuAlHemio/hllib]

HLLib is a package library for Half-Life that abstracts several package formats (BSP, GCF, NCF, PAK, VPK, WAD, XZP, uncompressed ZIP) and provides a simple interface for all of them

VTFLib [NeilJed/VTFLib]

About VTFLib is a LGPL open source programming library that provides a C and C++ API for reading and writing Valve VTF and VMT format image files.

BSPSource [ata4/bspsrc]

A Source engine map decompiler

jbn-bsp-lump-tools [wfowler1/jbn-bsp-lump-tools]

BSP structure optimizer and decompiler. Currently supported formats: James Bond 007: Nightfire (PC), Quake 2, SiN, Soldier of Fortune. Partially supported formats: Quake 3, Doom/Doom 2 WADfiles, Source Engine, Star Wars: Jedi Outcast, Soldier of Fortune 2, Return to Castle Wolfenstein, Medal of Honor (Allied Assault, Spearhead, Breakthrough), Call of Duty, Call of Duty 2, Call of Duty 4, American McGee's Alice, Heavy Metal FAKK²

Simple Quake Launcher 2 [m-x-d/Simple-Quake-Launcher-2]

A simple map/mod/demo launcher for Quake, Quake 2, Hexen 2 and Half-Life.