Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
MongoDB Stitch - The serverless platform from MongoDB
Supabase - An open source Firebase alternative
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs
neo4j - Meet Neo4j: The graph database platform powering today's mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.