DBU by Prodata

Version 5 is current, Version 6 is available for download

Other utilities besides DBU:

Nest RPG

SQL

Retrieve Deleted Records

Convert RPG

Diagnose Source Member which

embeds diagnostic compiler messages into your source

DBU sample screen below

Shows Logical File Dependancies

Other good stuff …

Authority Controls

Color controls of fields

Data Structure to parse fields

Character and Hex Displays

Search Forwards and Backwards

Field Listing and Re-sequencing Fields on screen

Search Forward and Backward