Tubecast is an awesome Youtube application for Windows Phone, and now it’s also available for Windows. We’ve been playing with it for the past few days and it feels a lot like the Windows Phone app. You can use it to watch Youtube videos, download videos to your machine, and cast video to DLNA devices such as a smart TV or the Xbox One.
More details: http://www.windowscentral.com/tubecast-windows-81-youtube-app