I’ve been a long time user (and fan) of Sunrise calendar. It was bought by Microsoft last year and they plan to shut it down at the end of July so I’ve been on the hunt for a new one. I’ver recently started using Fantastical and it actually is fantastic. (Note: it’s not free but they have a 21 day free trial and at this rate I’ll be paying them the $40 at the end of that).
Thought I’d share in case anyone else is in the market for a great calendar app (for Mac).