Geodatabase Diagrammer ArcGIS for Desktop
This will create a Visio diagram showing the classes and their schema in a geodatabase of your choosing. Use this tool to create a data model poster. This code was originally produced by ESRI (Richie Carmichael and Michael Zeiler) in 2002 for version 8.3. The link is http://www.arcgis.com/home/item.html?id=a378b48be11b45b5bb25254643304cb7. I only have recompiled for ArcGIS 10.7.1 and Visio Pro 2016-2019 32bit
This application does not support exotic custom feature class types. The types that are supported are:
Click Trust Center. Click Trust Center Settings Click File Block Settings Untick Boxes in File Block Settings