HL2-style, classic FPS movement for Unreal Engine implemented in C++

SteamVR driver for Half-Life-Alyx for playing without VR / драйвер для игры без VR

Half-Life SDK updated to compile under VS2019 and 2022. Check README.md for more information.

Portable Half-Life SDK. GoldSource and Xash3D. Crossplatform.

Speedrun and TAS tool for Half-Life & friends.

Tool for editing GoldSrc maps without decompiling

Modern Half-Life 1 SDK for Xash3D FWGS engine, has enhanced graphics and physics and a lot of new features for mod-makers. Crossplatform, supports Windows/Linux. Based on XashXT and Spirit Of Half-Life.

Goldsrc map viewer/editor without decompiling. Also can view .MDL models.

Half-Life: Opposing Force SDK based on Half-Life Updated, with bug fixes. Check README.md for more information.

Map compile tools for the Half-Life engine

Natural Selection mod for Half-life

Quake 2 modification with new renderer and many other unique features.

Half-Life PlayStation 2 map converter

AI Bot for Counter-Strike based on SyPB, fork of YaPB

Half-Life SDK for making mods upon it

Simple utility for mapping/scripting/speedrunning or researching games based on GoldSrc/Xash3D FWGS engine (such as CS 1.6, Half-Life, and other mods)

Client-Mod is a modification of the Half-Life client part for Xash3D FWGS and GoldSource

Half-Life: Blue Shift SDK based on Half-Life Updated, with bug fixes. Check README.md for more information.

SourcePawn Scripting Engine for Half-Life 1 based games