Disk Doctor 128 is a Commodore 128 (40 Column) disk track & sector editor. This is one POWERFUL utility with a really nice interface. Highly recommend this for your toolbox of utilities.

Not really sure what is improved on since version 1.0, but there is an added 30 blocks of code, so there must be something good inside.

Disk Noser 128 v1.5 by Ed Parry was released on 3/9/87.  Disk Noser is a nice Commodore 128 (80 column only) disk editor with easy navigation and detailed views of disk data down to the single byte.

Guru 80 v1.1 by Kenneth E. Kahl (1990) is a track and sector editor for the Commodore 128 in 80 Column mode.  

(c)1987 by John F. Navitsky II. Sector Edit 128 is one of the most powerful disk editors I have ever seen for the Commodore 128. This 80 column program can do just about everything you could want including reads & writes to drive memory. Help is built in.

Sector Editor for the Commodore 128 is a straight forward, no frills track & sector editor written 100% in BASIC, so if you want some sample code, here's a good place to look.

(c)1985 by John Dearinger. This utility will attempt to recover the data on tracks and sectors. Works with the C128 & 1571 drive (or two drives).

The Editor v4.0 by John Dearinger (1985), modified by Nick Whithers & Kirk McMillan (1992) is an excellent example of a floppy disk track / sector editor for the Commodore 128 (80 column mode only).  Included on the disk is some general useage documentation, but it should be pretty self explanatory.