Pakrat is a graphical replacement for the BSPZIP program, that allows you to embed external files, such as textures (vtf), material (vmt) and model (mdl) files into a HL2 bsp file.
BspZipGui AlternativesGame Development Tools and other similar apps like BspZipGui
BspZipGui is described as 'Is GUI tool for Valve's BSPZIP command line utility. It is used to easily embed a folder with all your custom files(textures, models, scripts etc) into a BSP file. With BspZipGui you can also extract all files contained inside BSP file' and is a game development tool in the development category. There are 1 alternatives to BspZipGui for Windows. The best BspZipGui alternative is Pakrat, which is free.