OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.
AWS Amplify - JavaScript library for app development using cloud services
Pushy - Pushy is a reliable push notification gateway for time-sensitive, mission-critical apps.
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs