Having a secondary screen has its benefits, but buying a second monitor may not always be a feasible solution. If you have a smart device lying around, say like an older tablet, you can now turn it into a secondary monitor for your PC using Deskreen. A free open-source app, Deskreen lets you use any device with a web browser as a second screen over Wi-Fi. Best of all, it offers support for Windows, macOS, and Linux.
Right now it still does need a cheap Dummy Display Plug (to make it think that an external display is connected) but they are asking for coding assistance to try and eliminate the need for the plug.
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Deskreen turns any device into a secondary screen for your PC#
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screenshotDeskreen is an open-source app that lets you use a tablet or phone as a secondary display for your PC over Wi-Fi. Check it out!