Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
ShareTube - Watch YouTube, synced with friends.
Twinjack - Stream Spotify music with anyone with just a link
Showgoers - Showgoers is a website dedicated to watching Netflix movies together with friends or loved ones who are not sitting on the same PC.
Parallel - Listen to music with friends over Spotify at the same time
Netflix Party - Netflix Party is an extension for watching Netflix remotely with friends and family for movies nights with that long-distance special someone.