Duet Display!

spacedesk is a windows network display monitor software that expands the Windows desktop computer screen to other computers over the local area network.

Use your iPad as a wireless display, to extend your computer desktop. Ever wish you had an extra display for your computer? There’s an app for that! With Air Display, you can use your iPad as an additional monitor for your Mac OS X or Windows computer. You can connect via USB (for the best speed and reliability) or Wi-Fi (if you want to walk around with your tablet).

Turn your iPad/iPhone or Android tablet or smartphone into a convenient side monitor for your Windows or Mac desktop. iDisplay is a universal app specially optimized for iPad, iPhone, iPod Touch, and Android devices screens.

Use the Mac creative tools you know & love, like Photoshop, with the touch experience of your iPad and the precision of Apple Pencil.

Smart devices become monitors by connecting them to a PC via USB! The Convenient Connect TwomonUSB

Turn your iPad or iPhone into high performance extra monitor for your computer

DisplayPad is a cutting edge app that allows you to use your iPhone as a second display for your Mac. You can extend your desktop with a wireless display that you can carry around with you!