I maintain a similar index-of-indexes but it's intentionally non-curated, restricted to indexes that use the OPML format, and uses autodiscovery to expand the list. The site needs some work, but it's up to 356 indexes.
I'd recommend looking at anything with "planet" in the name, there are a bunch of tech communities that manage community feeds and they are high quality. There are also a ton of personal blogroll recommendations via micro.blog too.
I also have a separate list of my favorite parts of the internet I plan to eventually turn into something like this: https://wilderness.land/ (my inspo)
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I maintain a similar index-of-indexes but it's intentionally non-curated, restricted to indexes that use the OPML format, and uses autodiscovery to expand the list. The site needs some work, but it's up to 356 indexes.
https://blogroll-network.alexsci.com/blogrolls/
I'd recommend looking at anything with "planet" in the name, there are a bunch of tech communities that manage community feeds and they are high quality. There are also a ton of personal blogroll recommendations via micro.blog too.
Another index-of-indexes is https://brisray.com/web/webring-list.htm, which tracks 648 webrings!
And https://brisray.com/web/indiedirs.htm, which has some other great indieweb indexes
Now we need an index of indexes of indexes. I too keep such a list but it's just an Obsidian note I manually update
https://news.ycombinator.com/item?id=48089823
I also have a separate list of my favorite parts of the internet I plan to eventually turn into something like this: https://wilderness.land/ (my inspo)