Amethyst

The open protocol that creates a censorship-resistant global "social" network is based on cryptographic keys and signatures, making it tamperproof. It does not rely on any central server or P2P techniques and is resilient as a result. Everyone runs a client, which can be a native or web version, to publish posts that are signed with their key and sent to multiple relays. Updates from other users are requested by asking multiple relays if they have any information about those users. Any individual can run a relay, which simply accepts and forwards posts without requiring trust. Verification of signatures occurs on the client side.

friendica is a decentralized social network. Decentralized architecture with no central authority or ownership. Relationships can be made across any compatible system, creating a network of Internet scale made up of smaller sites. Seamless wall-to-wall posts and remote comments, even across different network nodes. Access lists for every item. Private conversation groups — on these pages all communications are restricted to group members. One-to-one private messaging on supported protocols. Optionally "expire" old content after a certain period of time. Download your personal data. It all belongs to you. Built-in support for ActivityPub (e.g. Funkwhale, Hubzilla, Mastodon, Pleroma, Pixelfed), OStatus (e.g. StatusNet, GNU social, Quitter) and diaspora* protocols. Support for email contacts and communications (two-way) via IMAP4rev1/ESMTP.