Federation search shares details of what it finds. We look at its results to see who uses what plugins.
http://next.ward.dojo.fed.wiki/assets/pages/plugins-in-use/observed.txt
Import of 43 pages
making
Download federation search data. tgz 
ls sites|\ while read s\ do cat sites/$s/plugins.txt\ done | sort | uniq -c | sort -n
pages/plugins-in-use
We've written more scripts to find the sites and pages where a few of these plugins are used. We convert the shell output to page json and import it here.
for i in ...; do sh pages.sh $i >pages/$i; done sh pages.sh turtle >pages/turtle deno run --allow-read export.js >export.json