Google Calendar - Spend less time managing your day & more time enjoying it
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Jorte - Schedule books must be practical and has a good design.
Microsoft Outlook Calendar - Calendar is a time-management web application by Microsoft.
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.