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 iPad, Mac, Windows, iPhone and Linux apps. The best Yam Display alternative is Tab Display, which is free. Other great apps like Yam Display are Deskreen, Weylus, Duet Display and Orion - HDMI Monitor.
Tab Display turns tablets and computers into portable second screens for Mac and Windows, helping you extend your workspace across iPad, Android, macOS, and Windows devices.
Deskreen turns any device with a web browser to a second screen for your computer
Weylus turns your tablet or smart phone into a graphic tablet/touch screen for your computer.
Turns iOS or Android devices into efficient second displays or graphics tablets for Mac and PC, delivering zero-lag, high-resolution output with touch, gesture, and touch bar support, hardware-free setup, secure remote desktop capabilities, and end-to-end encryption.
A small, fun app that helps you use your iPad as an external HDMI display for any camera, video game console, or even VHS.
CamX - USB Camera is a multifunctional iOS app that converts your device into a portable video capture tool, capable of recording from various sources, and can also serve as a gaming console display or secondary screen.
Genki Studio is a software that turns your iPad into a portable monitor and video capture device. It connects to a Genki ShadowCast or any USB UVC device, with features like external monitor support, Apple Pencil markup, and multitasking.
Use your iPad as a wireless display, to extend your Mac 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 (Windows no longer supported)
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.
Make your iPad/tablet/computer into a secondary monitor on Linux. - GitHub - kbumsik/VirtScreen: Make your iPad/tablet/computer into a secondary monitor on Linux.
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I like Deskreen as an alternative to Yam because it is free, fast and open source! And it has support for wifi too!