A build tool for creating clean, standalone releases of games built on the DarkPlaces (Quake) engine.

QPakMan is a command-line (text only) program for managing the PAK and WAD files used by the games Quake, Quake II and Hexen II.

A nice, custom, GUI that allows extracting Garry's Mod addon files (.GMA).

PakScape is a PAK and PK3 explorer/creator. It doubles as a ZIP explorer/creator because PK3 files are really ZIP files.

GCFScape is a small tool that can open and extract from BSP, WAD, PAK, GCF, VPK, NCP, XZP files.

VTFEdit is a powerful tool allowing files of various formats to be converted to/from VTF format in all of the Source texture formats.

quake-cli-tools is a set of command line tools for creating Quake content.

Very powerful tool that can download items from Steam workshop, unpack/pack VPK and GMA, view models, decompile and compile models.