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.
Lightning Calendar - Organize your life — it’s about time!
24me - Next Generation Personal Assistant
Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.
Calvetica - The fast calendar for iPhone. Add an event in just two quick taps.