DeleteExt rapidly deletes all files of a given extension from all your hard drives.
Local copies of miscellaneous utilities:
Cabarc from the IEAK can extract the contents of a cab file or create a new one from existing files.
DelPart removes individual partitions (not logical drives). Run it from a boot floppy.
FD or File Director is an old DOS utility with split screens for easy file manipulation. This util is one of my all time favorites. I will make a page with detailed info one day...