Baqend Platform - Baqend is a Backend-as-a-Service for web and mobile apps.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Apache UserGrid - Usergrid is an open-source BaaS enabling developers to rapidly build web and/or mobile applications.
AWS Amplify - JavaScript library for app development using cloud services
Halosys - Halosys provides of enterprise mobile backend API platform and mobile information management solution.
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs