Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Dead Simple Screen Sharing - Simple screen sharing and audio conferencing software.
Pushbullet - Pushbullet - Your devices working better together
Muzzle - Silence embarrassing notifications while screensharing
Gotify - a simple self-hosted server for sending and receiving messages
Surfly - Simple, Fast, and Secure Co-browsing