opendisplay
Free, open-source Sidecar/Duet alternative — use your iPhone or iPad as a true second monitor for your Mac over USB or WiFi. Low latency H.264, Retina HiDPI, touch input.
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didriksg/crisp
A free, open-source alternative to BetterDisplay and Lunar. Every display control macOS hides in one menu bar panel: external monitor brightness (DDC or software), HiDPI scaling, XDR presets, virtual displays, color, and arrangement. Feels like it shipped with your Mac.
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TAKE A CLOSER LOOK
The repository is the place to check installation steps, supported platforms, the license, and current maintenance before choosing a tool.
Read the documentation on GitHub ↗Find projects in the same areas, or search the archive for a different approach.