The multi-monitor display extension app, spacedesk lets you use other devices and computers on your LAN (Local Area Network) as monitors for your Windows desktop. At least 2 machines are needed to operate spacedesk.
Duet makes your iPad and your Mac more powerful together. Slide Mac apps to your iPad as a second display. No lag, Duet helps you multi-task and work faster with more screen space. It doesn't require internet, just plug and play to get started and you can use the iPad's...
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 your iPad, Android tablet, Kindle or smartphone into a high performance extra monitor for your computer
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)
superDisplay turns your Android device into a portable USB display for your Windows 10 PC. Duplicate or extend your screen simply by plugging in your phone or tablet.This app doesn't have any features at the moment.
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.
The Android app is not available anymore, and it seems the desktop app hasn't worked well for years. The iOS app was last updated in 2017, so you might want to avoid it.
Allows using a tablet device with stylus or digitizer input in the same way as a dedicated wireless tablet. Use your phone or tablet as a Wacom device essentially.