* Tildes (https://tildes.net/) - made by an ex-Redditor, it is designed to be an open source community website that doesn't rely on profits to survive. Also doesn't have Reddit's dark pattern. A very small, tight knit community.
* Lobsters (https://lobste.rs/) - very programmer centric community.
* Lemmy (https://lemmy.ml/) - heavily leftist community, and decentralised.
Special mention goes to QotNews (https://news.t0.vc/) - Not really a community, more of combo of most of the above
A newer server operated by the Mastodon gGmbH non-profit