myCircle.tv - Watch synchronized videos from Youtube, Dailymotion or Vimeo with your friends up to 20.
Metastream - Watch streaming media with friends
Kast - Kast is a social sharing platform where users can stream content from their computer to the people...
Kosmi - Digital Hangouts Reinvented
SyncTube - A simple platform where you can create rooms, manage permissions and chat while watching YouTube videos synchronized with your friends.
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.