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 Android 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.
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.
Germany
EU
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.
Turn any Mac you already own — even an old iMac — into a true extended second display for your Mac. No dongle, no subscription, no account, no cloud.
ItalyEU
Control your Mac from iPhone or iPad by touch, or play Mac games with an on-screen controller. Free on your own Wi-Fi, no account.
Hong Kong SAR China
BetterCast lets you use your old device (Mac, Android, iPhone) as real extended displays with zero subscriptions, zero cloud, and native macOS performance.
Philippines
Uses local Wi-Fi, Ethernet, or Thunderbolt Bridge to add a Mac, Windows PC, or Android device as extra Mac desktop space, or mirror screens on supported computers. It is free, needs no account, subscription, dongle, or cloud relay, and is for trusted networks.
Taiwan
MirrorHall creates virtual second monitors over the network using UDP video streaming among Linux desktop or mobile devices. It is optimized for low latency, and is based on gstreamer and GNOME's mutter screen sharing APIs.
