Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Datahike - A durable datalog database adaptable for distribution.
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
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
Matisse - Matisse is a post-relational SQL database.