B4X - Cross platform development tools for native iOS, Android, desktop and server applications.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Sencha Touch - The leading mobile web app framework based on HTML5 for amazing mobile apps.
AWS Amplify - JavaScript library for app development using cloud services
Appcelerator Titanium - Appcelerator Open Source
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs