This Commodore 128 directory editor for the 1581 is very capable. Among the options are alphabetizing a disk, inserting comments, exchanging directory entries, inserting blank entries and even operating on sub-directories. Built-in help is more than adequate. Also on this disk is a C64 version.

All Device Directory Editor 128 v1.1 by Douglas McLaughlin - This handy directory editor for the Commodore 128 is nice because it supports almost all (no CBM 9060 support) Commodore and CMD drives, including the CMD HD & RAMLink.  There is a decent docs file on the disk, and the screen shots don't really do the program justice.

Dedit 128 v7.0 by Jerome P. Yoner is a sorting utility for disk directories.  There is support for both automatic and manual sorting and up to 1000 entries.  Full docs are included in the archive.

Dir Squeezer 128 for the Commodore 128 Removes unused directory entries from an 1571 disk drive.

Directory Editor v18.0 by Eric Edward is a Commodore 128 (80 Columns) program for editing the directory of a floppy disk.

Very handy utility for manipulating a directory. Help is built into the program thankfully because there are quite a few options. One of my favorite is the 'trace file links' option.

Very powerful directory tool for the Commodore 128 with a simple interface. There is a built-in help ('h' key).

Nice 80 column directory utility for the C128. Supports sub-directories.