MeowDisplay
Use an iPhone, iPad or spare Mac as a touch screen for your Mac, free
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If you work across a Mac, a Windows box and an Android phone, this replaces two or three half-working tools with one free app that keeps everything on your own devices.
TwinDesk lets the pointer slide off one screen onto another computer and carries files, clipboard and a second-monitor extension with it. On Android it brings calls, texts and photos to the desktop, and turns the phone into a webcam, touchpad or gamepad. Devices pair directly over Wi-Fi, USB, Bluetooth or Wi-Fi Direct with end-to-end encryption. GPL-3.0. Builds are unsigned, so expect OS warnings on first launch, and multi-device mesh is still beta.
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