I've been drawn to kbin, it is part of the "Fediverse", so you can see kbin, lemmy, and I believe also mastodon posts from it. If you just anonymously browse to https://kbin.social/ (the main instance right now) you'll have something similar to the reddit front page, content from a bunch of different instances. It is definitely still a little rough around the edges, but considering it is one dev and the first commit was only two years ago, it seems pretty good.