Vidlis - Create music playlists from YouTube videos.
Togetherly - Watch Youtube with friends
DiskyT - Youtube playlists done right
ShareTube - Watch YouTube, synced with friends.
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Showgoers - Showgoers is a website dedicated to watching Netflix movies together with friends or loved ones who are not sitting on the same PC.