Calendar sync that knows how to keep a secret.
Capycal copies events from one calendar into another, every few minutes, and you decide what the copies show. Your colleagues see when you're busy. Your dentist appointment stays between you and your dentist.
It works with any CalDAV server, the calendars in the Mac's Calendar app and .ics feeds. It runs as a menu bar app on the Mac, a tray app on Linux or a single binary on a server, and talks only to your calendars: no account, no cloud service in between. Free software under the GPL.
capycal.app GitHub