Google Calendar - Spend less time managing your day & more time enjoying it
24me - Next Generation Personal Assistant
Lightning Calendar - Organize your life — it’s about time!
WeekCalendar - WeekCalendar is an all-in-one calendar application designed to provide everyone with all the features they need to work to their fullest.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Calvetica - The fast calendar for iPhone. Add an event in just two quick taps.