If all your host machines are Windows 8+, then Parsec is fantastic and has clients for every major OS other than iOS.
I tried Parsec on one machine and was super disappointed. Video quality and latency were fine, but audio sounded like crap, despite streaming at 512kbps. Since there's no option to stream uncompressed audio, and no debug options to figure out why it sounded so terrible, I had to write off their entire product as unusable.