Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
ColdCast - An open social network with zero corporate interference.
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
GNU social - GNU social is communication software for both public and private communications.
Lemmy - Federated link aggregator and Reddit alternative built with Rust
Pleroma - Pleroma is a free, federated social networking server built on open protocols.