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Self hosted calendar, and Contacts

CalDav Server:

Clients:

PC: Vivaldi, Thunderbird (and KOrganizer for importing ICS files and syncing them to CalDav Server)
Thunderbird also for contact management
Android: DAVx⁵ for Syncing Calendars to device, ICSx⁵ for syncing external WebICS Calendars.
org.fossify.calendar as GUI to the calendars.

Calender Sharing:

Sharing Calendars, log in (with your user account, not with the admin account) to <YOUR SERVER>/dav.php, navigate to calender, at the bottom share with other user on your server (incl. mailto:). (You may need to create those users), see https://devblog.yvn.no/posts/baikal-caldav-hosting/