https://pastecal.com - zero-login shared calendar.
(Inspiration: https://github.com/joereynolds/what-to-code#websites and https://www.viaprize.org/prize/old/1)
Use cases:
Make a shared calendar a single click, no logins. Anyone with the link can view/edit the calendar (like a wiki).
Pick your own ID or use the random default ID. Visit pastecal.com/customID and click create.
Visit homepage, make changes, and get a private calendar without sharing (stored in localStorage). No need to publish.
Open a calendar with a specific pre-filled date/view using pastecal.com/?d={YYYYMMDD|YYMMDD|YY-MM-DD...}&v={day,week,month,year}
. Example: pastecal.com/?d=2022-04-01&v=month
Screenshots: