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AWS Amplify - JavaScript library for app development using cloud services
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Azure Mobile Apps - Build engaging cross-platform and native apps for iOS, Android, Windows or Mac with Azure's Mobile App Service.
MongoDB Stitch - The serverless platform from MongoDB
Apache UserGrid - Usergrid is an open-source BaaS enabling developers to rapidly build web and/or mobile applications.
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.