Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Backendless - Backendless is a mobile Backend as a Service (mBaaS) platform.
AWS Amplify - JavaScript library for app development using cloud services
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Azure Mobile Apps - Build engaging cross-platform and native apps for iOS, Android, Windows or Mac with Azure's Mobile App Service.