Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
JsonAPI - Application and Data, Languages & Frameworks, and Query Languages
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
graphql.js - A reference implementation of GraphQL for JavaScript - graphql/graphql-js
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
Apollo - Apollo is a full project management and contact tracking application.