Pushline is an app for Android to PC/Mac Notifications' Mirroring and Phone control.

Join allows you to easily do stuff remotely on your Android and PC devices like SMS, notifications, clipboard, and much more.

Boxcar is a universal push notification platform.

SashiDo.io is a Parse server alternative hosting for busy people.

Pushover is a simple push notification service that integrates easily into web apps like IFTTT, network monitors like Nagios, shell scripts, servers, etc.