Lemmy is a selfhosted, federated social link aggregation and discussion forum. It consists of many different communities which are focused on different topics. Users can post text, links or images and discuss it with others.
MetaFilter (MeFi) is a community weblog where anyone can contribute and where you'll find some of the most interesting stuff on the internet. Since 1999, we've been focused on fulfilling the web's potential to bring people together and create genuine, vibrant, good-hearted community spaces.
Federated, open‑source, ad‑free, and fully under your control. Build or join a community that reflects your values – no algorithms, no corporate overlords.
Tildes.net is a non-profit, open-source, text-focused community website and a Reddit alternative.