Ask HN: Sunrise Calendar alternatives?

My favorite calendar app, Sunrise, is finally shutting down altogether thanks to Microsoft [1]. I've come to rely on it so heavily that the product shutting down feels depressing to me. What are some other comparable products? (in terms of integrations, UX, and design) I'm not really interested in using Outlook...

[1] http://www.theverge.com/2016/5/11/11657960/microsoft-shutting-down-sunrise-app