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We Need to Talk About the State of Calendar Software on Desktop
(nadim.computer)
This is a most excellent place for technology news and articles.
Rainlendar is good and works on Windows and Linux. It's not open source though, and some features such as Caldav support require a pro license for €10
I used to use this maybe a decade ago. I'm glad to see it's still around!
I've unfortunately switched to Google Calendar when my workplace started using it informally, and it's just been the easiest to stick with.