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Metastream - Watch streaming media with friends
BitTorrent Live - Live streaming video. iPhone, Apple TV, MacOS. Android soon.
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
tvOS 12 - Apple TV's powerful new operating system
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.
WWDC TV - Watch WWDC video on your Apple TV