Plex for Alexa - Run your home theater or play your favorite playlists
Apple TV - New Apple TV running tvOS
BitTorrent Live - Live streaming video. iPhone, Apple TV, MacOS. Android soon.
Stremio - Watch videos, movies, TV series and TV channels instantly.
Mi Box - 4K Ultra HD streaming and gaming box powered by Android TV
WWDC TV - Watch WWDC video on your Apple TV