TwinDesk
A free, local alternative to Synergy and KDE Connect rolled into one app
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A free, GPL-licensed alternative to paid second-screen apps like Duet and Luna, with real touch control of macOS from the device already in your pocket.
MeowDisplay streams your Mac to an iPhone, iPad, another Mac or, in closed testing, Android, either mirroring the screen or extending it, and lets you drive macOS by touch, trackpad gestures or Apple Pencil. It connects over USB, local Wi-Fi or Tailscale, can wake a sleeping Mac, and shows several windows as tabs. Version 2.0 is on the App Store. It builds on OpenDisplay; the maker credits it and is candid about missing HDR and unverified colour.
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