Google Calendar - Spend less time managing your day & more time enjoying it
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
Cozi - Cozi | Must-have app for the modern family
24me - Next Generation Personal Assistant
WAVE Calendar - WAVE Calendar is a revolutionary app, which is designed to bring balance to your life
Calvetica - The fast calendar for iPhone. Add an event in just two quick taps.