Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Supabase - An open source Firebase alternative
Meteor - Meteor is a set of new technologies for building top-quality web apps in a fraction of the time.
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA
GUN - Self-hosted Firebase.
dweet.io - Ridiculously simple data sharing for the Internet of Things.