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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.
IINA - The modern video player for macOS
Hyperbeam - A better way to watch together online
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.