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
I have a backlog item for that feature 😉 I think it should be possible with the Lemmy websocket API! https://github.com/tgxn/lemmy-explorer/issues/5