Decompiler for many BSP formats

Tool for editing GoldSrc maps without decompiling

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

Half-Life PlayStation 2 map converter

Tools for Playstation 2 Half-Life port

Command-line tools for making/extracting Half-Life textures and sprites

Crowbar - GoldSource and Source Engine Modding Tool

Cross-platform Half-Life 1 map decompiler

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

Half-Life Asset Manager, a tool to view and edit Half-Life 1 models

Cross-Platform Level Editor

Cross engine parser for every VaLVe game!

compLexity Demo Player

GoldSrc DLL decryptor for older GoldSrc builds.

GIMP plugin for import and export of Half-Life sprites (.spr)

A CLI/GUI tool to create, read, and write several pack file formats.

A Visual C++ application for creating and editing 3D game texture files for games such as Quake II and Half-Life.

Half-Life Texture Tools - create and view wad and spr files

Python library for analysing .bsp files

Image tempdecal.wad converter

Resource file (.res) generator and map packer for Sven Co-op

RESGen. A tool to create .res files for Half-Life.

Source and GoldSrc Query Tool

An extractor and packager for Nexon Archive files

Utility for Windows and macOS to assist with (re)building Dreamcast .gdi images from scratch

Converts Dreamcast Half-Life models with *.PVR textures to normal PC Half-Life format