GCFScape
Valve GCF file extractor
GCFScape is an explorer like utility that enables users to browse Half-Life packages and extract their contents. GCFScape supports .bsp, .gcf, .ncf, .pak, .vpk, .wad and .xzp packages and runs independently of Steam.
http://nemesis.thewavelength.net/index.php?p=25
Development
Game
Game Cache File
No Cache File
Pack File
Archive File
Valve Pack File
Half-Life 1 Texture Package
XBox Zip File