If you use Zettlr, or any other editor to create a linked graph of text files, you might be interesting in vizel[0]:
It visualizes the graph and calculates some stats. I find it useful to track the growth of my Zettelkasten, but also to find notes and components that are unconnected to the rest of the graph.
I built it to scratch my own itch, but I'm always happy to get feedback.