Metastream - Watch streaming media with friends
Apple TV - New Apple TV running tvOS
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
Hyperbeam - A better way to watch together online
Stremio - Watch videos, movies, TV series and TV channels instantly.