I'm sure someone out there would find this utility useful.  basically it lets you show or print out the internal code of the PLA chip.  Brought to you by Near Letter Quantity software. 

String Finder - searches through the disk for any occurrences of a specified string.  this is the uncompiled version of "disk $finder".  written in basic, it would allow for changes in the starting track, etc.

Super Directory released in 1984 by PSIDAC - Neat tool that will analyze all the files on a disk and give you the starting track and sector of each with the option to send the results to a printer.

SuperLock 64 is a utility that can be used to lock a disk so that it can't be written to.  You can still read and copy from the disk, but short of reformatting the disk you won't be able to write to it again.

Track Copy by E. Steiner was released in 1986.  You can copy tracks 1 - 42 and need to know how to read a little German.

Two Drive 1541 - from the Transactor, 9/85. Most commands for device #8, drive #1 are re-directed to device #9 by this small ml routine located in the cassette buffer.

Unscratch is a simple utility that lets you recover deleted files.

Virtual Directory by Robert E. Mason is a utility for the Commodore 64 or Commodore 128 in 40/80 column mode that will analyze the files on a disk and present you with information such as the file type, load address, starting track and sector and block size.

Written by Will Corley, Zeek 1541 is a full text search.  Works on Seq and Prg files.