Sadly missed add-ons that used data
There are a number of add-ons that have disappeared from Visio over the years. This could be for very good reasons, but we oldies still miss some of their capabilities. So, I mention them not only to warn you that some documentation you may find on the web is out-of-date, but also possibly to encourage reincarnations.
For example, the Flowchart-TQM Wizard and the Network Diagram Wizard were deprecated in Visio 2003, but they provided a method to not only add shapes with data, but also to connect them together. The data linking and structured diagram concepts have been added to Visio since then, so a reincarnation would need to account for these.
The network discovery tool was last seen back in the Visio 2000 Enterprise ...