Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Datomic - The fully transactional, cloud-ready, distributed database
AWS Amplify - JavaScript library for app development using cloud services
Google Cloud Datastore - Cloud Datastore is a NoSQL database for your web and mobile applications.
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs
Datahike - A durable datalog database adaptable for distribution.