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Metastream - Watch streaming media with friends
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
SyncTube - A simple platform where you can create rooms, manage permissions and chat while watching YouTube videos synchronized with your friends.
Hyperbeam - A better way to watch together online
WatchParty.me - WatchParty.me is a video streaming platform where you can watch streams with your friends in a private virtual lobby.
Kosmi - Digital Hangouts Reinvented