Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Supabase - An open source Firebase alternative
AWS Amplify - JavaScript library for app development using cloud services
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs