Pleroma - Pleroma is a free, federated social networking server built on open protocols.
Gab - Gab is an ad-free social network dedicated to free speech.
GNU social - GNU social is communication software for both public and private communications.
PixelFed - PixelFed is a federated image sharing platform, powered by the ActivityPub protocol.
ZeroMe - Social network for the distributed P2P network ZeroNet.
Friendica - Decentralisation - Privacy - Interoperability