Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Lightning Calendar - Organize your life — it’s about time!
Rainlendar - Rainlendar - Customizable desktop calendar
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Google Calendar - Spend less time managing your day & more time enjoying it
SSuite My Calendar Diary - A portable calendar and diary for people on the move...