Here you'll find some really useful tools for working with Source:
GCF ScapeAccess the content of steam cache files
VMEXBSP Decompiler
MDL Decompilereg if you need some qc params..
VTF-Plugin for PhotoshopEdit (simple) VTFs
VTF Shell ExtensionNeed thumbnails of your textures?
C4D SMD Plugin Export to SMD format with Cinema4D
PakratEmbed custom stuff into a BSP file
EntEdEdit entities in BSPs
GUIStudioMDLGUI for studiomdl.exe