Yam Display is described as 'Turns your iPad/iPhone into an external monitor for your Mac. Wired by USB, browse documents or watch videos without delay. Touch your Mac and pinch to zoom on beautiful retina display. For multitasking enabled iPads, you can utilize every single pixel of your screen' and is an app. There are more than 10 alternatives to Yam Display for a variety of platforms, including Mac, iPad, Windows, iPhone and Linux apps. The best Yam Display alternative is Side Screen, which is both free and Open Source. Other great apps like Yam Display are Tab Display, Deskreen, Weylus and EasySwitch.
I like Deskreen as an alternative to Yam because it is free, fast and open source! And it has support for wifi too!