Plex for Alexa - Run your home theater or play your favorite playlists
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.
Mi Box - 4K Ultra HD streaming and gaming box powered by Android TV
Kosmi - Digital Hangouts Reinvented