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Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
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!
Kontact - Kontact is the integrated Personal Information Manager of KDE.
Rainlendar - Rainlendar - Customizable desktop calendar
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.