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.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.
Pushbullet - Pushbullet - Your devices working better together
Pushy - Pushy is a reliable push notification gateway for time-sensitive, mission-critical apps.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.