Pushbullet for Mac - Send your iOS notifications to your Mac
Pushbullet - Pushbullet - Your devices working better together
Muzzle - Silence embarrassing notifications while screensharing
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
CleanSpark - Declutter your screen to share it on your next presentation
Gotify - a simple self-hosted server for sending and receiving messages