macOS 14 or later
Decky Display for Mac
Any Mac can be the screen, and you can drive it
FreeThe same client, as its own Mac app. A second Mac, or the laptop somebody brought to the meeting, becomes a display or a viewer. It installs and runs without Decky on the same machine.
Keyboard and pointer go back
Unlike a tablet on WiFi, a Mac showing another Mac's screen can drive it. Your keyboard and trackpad reach across.
Ask for the shape you want
Its main screen, one of its monitors, a fixed size, or a desktop cut to one window. Chosen before connecting, because a display cannot be resized in place.
Pick from its windows
The other Mac offers its window list with the hidden and minimised ones marked, and Decky brings the one you chose back and fits it.
It needs no permissions at all
No private APIs, no sandbox exceptions, nothing to approve in System Settings. That is exactly what lets it be given away.
Free. It is a viewer and a display; the machine doing the giving is the one that needs Decky.