Surfly - Simple, Fast, and Secure Co-browsing
Togetherly - Watch Youtube with friends
Muzzle - Silence embarrassing notifications while screensharing
ShareTube - Watch YouTube, synced with friends.
Mutify - Use a shortcut on any Mac device to mute your microphone
Showgoers - Showgoers is a website dedicated to watching Netflix movies together with friends or loved ones who are not sitting on the same PC.