VMEX decompiles source levels. 

The download package here has different special versions in it should that site ever disappear.

A small program for finding out the correct materials and the address that a model will use. See the readme in the download for how to use... I just use it from the desktop and drop a mdl file on the MDLTextureInfo application file and a window opens up...

For grabbing custom content out of a bsp file with included content.

Note: Try this and read the readme on how to work this, the difference between this and Pakrat is this not only grabs material, model and sound files from a BSP, it also dumps them in the correct folders. Pakrat does not do this.