I wrote a simple program that downloads the package repository file, parses it and creates an SQLite DB with all the link information and a simple Flask web app to browse it. This is what it looks like when showing the information page on Flex.
In addition you can do all sorts of analysis on the data. As an example here are the 20 packages that are depended on the most followed by the number of packages that depend on them:
And here is the same for build-dependencies:
The numbers are not exact because the parser is not perfect but as rough estimates these should be reliable. Just don't use them for anything requiring actual accuracy, ok?
The code is here. I probably won't work on it any more due to other obligations, but feel free to play around with it if you wish.