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Savvycal integrates with Fastmail.

And generic CalDAV support would be even better.

But it is hit or miss, e.g. it doesn't work with my Purelymail account.

hey, peer here from cal.com. we have an issue where we track all individual caldav implementations: https://github.com/calcom/cal.com/issues/9990

I use Fantastical as a calendar app and it has Openings feature https://flexibits.com/fantastical/scheduling (requires subscription)