(for this talk I will stay away from the blockchain)
GnuSocial
Pleroma
PeerTube
“Although the French government’s spokesperson said that the government’s app will be based on open source software found freely available on the internet, she declined to name it. However, Matrix developers have confirmed that the app in question will be based on the federated chat Matrix protocol (a more modern XMPP/Jabber competitor) and, more specifically, on the Riot client, which uses this protocol.”Source: France To Build Alternative To WhatsApp, Telegram Due To Foreign Spying Concerns
(IPFS, ZeroNet, Syncthing, ...)
(or in other words, how to be a good citizen on the Internet)
Even Github publishes feeds for repository activity:
Implemented by NextCloud, OwnCloud and Pydio