Fantastical, the indie darling of Apple calendar apps, embraces Windows (but not Android)
Briefly

Fantastical started out in 2011 as a simple Mac menu bar utility, allowing users to glance at upcoming events and create new ones by typing into a text field.
We decided that we're really going to fulfill our mission of making the best calendar app, and if we're only on the Apple platform, we can't do that.
Read at Fast Company
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