https://opendisplay.app/
OpenDisplay — Turn your spare Apple devices into second monitors for your Mac (free & open source)
OpenDisplay is a free, open-source alternative to Apple Sidecar and Duet Display. Turn your spare Apple devices — iPhone and iPad today, Macs on the roadmap —...
https://opendisplay.org/
OpenDisplay: the open e-paper standard
OpenDisplay is an open standard and open firmware that lets any sender put pictures on any screen. Local, low-power, designed for e-paper.
the openopendisplaypaperstandard