Various free useful utilities:

JPSoftware:  www.JPSoft.com

   Tcc/LE - cmd.exe on steroids.  Years ago this was sold as NDOS, 4DOS, and 4NT, but it's now at version 13.

NirSoft: www.NirSoft.net

   NirCmd.exe - another tool like Tcc/LE but with a good number of different more technically-oriented commands

   IconExtract - Searches a folder and, optionally subfolders and displays a list of files containing icons, with images, and can extract icons.

   Resource Extractor - Like Icon Extract except it can extract icons, bitmaps, AVI movies, HTML files and more from dll, ocx, and exe files

www.12Noon.com

   Display changer - command-line utility to change display resolution, etc.  (Also various other utilities.)