Sunrise was recently acquired by Microsoft. But don’t let that put you off, because it’s still free. It’s often billed as an alternative to OS X’s Calendar app, but it’s much more than that.
Sunrise can connect to Google Calendar, iCloud and Microsoft Exchange, as you’d expect. Of course, it’s also able to
import your existing calendars. Beyond that, you can also link Sunrise
to social media accounts such as FourSquare. By doing so, when you
use FourSquare to check in every time you go to work or the gym, Sunrise will display a record of how many times you’ve gone to that place during the month.
The app also supports Facebook event invitations, enabling you to respond to them within the app rather than going to the website. And, like all the best calendar apps, Sunrise supports natural language input for creating events.