Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Jamf Endpoint protection - Jamf Endpoint protection is an all-in-one endpoint security providing a utility that is designed for the macOS system.
Pushbullet - Pushbullet - Your devices working better together
VMware Endpoint Protection - VMware Endpoint Protection software is designed for modern enterprises that make sure security and compliance in order to prevent data breaches.
Gotify - a simple self-hosted server for sending and receiving messages
Mosyle Business - Mosyle Business is an apple based mobile device management solution that comes with scalable endpoint management for enterprises and provides complete security and cloud support.