jointhefediverse.net seems to be a commonly linked resource for directing people to join the Fediverse.
Curiously, it does not list Lemmy under the list of Reddit alternatives. Their GitHub README explains why.
Previous relevant discussion: https://lemmy.ml/post/78808
to anyone looking for somewhere other than Lemmy I’d like to suggest mbin. I’ll admit it’s not perfect (especially on mobile, interstellar is decent but it’s the only app and has some bugs) but it handles reddit-style content pretty much the same as Lemmy except for the lack of read-marking on posts. as a bonus, it handles microblogs so you can see those without an account on mastodon or something similar.
What bugs/issues does Interstellar have that you would like to see fixed? I’m Interstellar’s developer btw. I tried to get the majority of the know bugs fixed in the last big update. If there’s anything specific you’re running into, I can try to focus on that.