I made this website to crawl and display Lemmy instances since the existing ones were lacking certain filtering and search options.
I have licensed it as MIT and the code is on https://github.com/tgxn/lemmy-explorer
Let me know if there’s any issues, and create a GitHub issue if you want some features :D
This is extremely well put-together. Much more useable than browse.feddit.de. Thank you for this! It should definitely be included in any guides for getting started with Lemmy.