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.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.
Zuznow - Automatic mobile adaptation platform for enterprise applications
Pushy - Pushy is a reliable push notification gateway for time-sensitive, mission-critical apps.
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs