Tom Doyle W9KE has made available an amateur radio Satellite Explorer app for Windows 8 devices.
Explorer is a Windows 8 app that runs on Intel based tablets, laptops
and desktops as well as Windows RT tablets like the Microsoft Surface.
It is available in the Windows Store - search for 'Satellite Explorer'.
Tom says the app is of course free but if you find it of value please contribute something to your favorite AMSAT project.