I keep see people complaining about not being able to find active communities that match their interests. So I've added a new feature to https://www.search-lemmy.com/ that allows you to search posts for a particular topic and then it tells you which communities have the most posts matching your search query.
And assuming that you've set your home instance correctly, those links will even open up in your home instance, so that you can subscribe directly to them.
For example, if you search for 'linux' (https://www.search-lemmy.com/find-communities/results?query=linux&page=1) it gives you a link to each community, tells you which instance it's on and how many matches it found for your query.
All of the same filters that you can use on the normal search can be used here as well. So if you just want to find the best community that mentions linux on lemmy.world (https://www.search-lemmy.com/find-communities/results?query=linux+instance%3Alemmy.world&page=1), you can filter by just that instance. Click on the Search Tips
button to see a list of all of the available filters.
P.S. I'm aware of https://lemmyverse.net/ etc... and while those are great as well, this allows you to search to see what people are actually talking about on the various communities.
Again, if you have any feature requests or find any bugs, PLEASE reach out or ideally go to my github (https://github.com/marsara9/lemmy-search) and log a bug there.
Works great!