Lemmyverse - Filter and find Instances and Communities
Lemmy Community-Browser - Alternative site to search for communities
sub.rehab - Find where your favorite subreddit has made a community onn Lemmy
FediDB - View Stats about Fediverse and Lemmy Instances.
The Federation - Stats and Graphs on Fediverse Growth and Popular Instances on them
Awesome Lemmy Instances - Index of Popular Lemmy Instances
Fediverse Observer - Another site to find popular instances
Lemmymap - Size of Different Lemmy Instances Visualized
fedi-block - Find which instances have blocked your home instance
Fedisearch - Search Fediverse through various search engines

I also made a post collecting beginner guides for new lemmy users. Feel free to comment any new site and I'll update the list.

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[–] TWeaK@lemmy.fmhy.ml 5 points 1 year ago

Communities is definitely limited. You can't sort them, you can't filter them (particularly by instance when looking at All).

The best way to discover new comms seems to be using Lemmyverse, apparently you can set it to your own instance so that links come up in your instance, where you're logged in and can subscribe.