Togetherly - Watch Youtube with friends
Phonebot - Make phone calls from within a Slack channel
ShareTube - Watch YouTube, synced with friends.
HideMyFaceTime - Stop watching your own face during FaceTime calls.
Showgoers - Showgoers is a website dedicated to watching Netflix movies together with friends or loved ones who are not sitting on the same PC.
ShareAccount - Share your account without giving out your password