An open-source GoldSrc engine clone (Clean authentic reimplementation without using reverse-engineered code)
Map compilers for Half-Life 1
Axion is a modification of the Half-Life client for Xash3D FWGS and GoldSource
Blender plugin that allows for easier modding and animation of the Gold Source/Source/Titanfall armatures.
Python utility converting models from Source engine to GoldSource engine. This utility can convert models with any number of polygons.
Zombie Panic! (Half-Life Modification) using BFHL as a base.
Convert models from GoldSource engine to Source engine with AI
Simple library for the connect to GoldSrc (HL & CS1.6) Rcon.
GPL-licensed HLSDK (reimplemented using the original Quake engine and manually rewritten sources)
Another fork of ZHLT
A PowerShell module for compiling SourceMod (.sp) and AMX Mod X (.sma) plugin source files for Source / Goldsource games.
My little amxmodx plugins. Some of them were developed special for my HL server, others just for fun.
SDK Based on Half-Life: Unified SDK aiming to expand the topic
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