Parsec - Streams games locally or over the internet
Metastream - Watch streaming media with friends
Moonlight-Stream.org - Moonlight allows you to stream your collection of games from your GameStream-compatible PC to any...
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Vortex Cloud Gaming - Cloud gaming app allowing to play PC games on Android, PC or even in web browser
Hyperbeam - A better way to watch together online