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One Calendar

OneCalendar is a powerful tool that integrates all your calendars into one easy to read overview. View and manage all your appointments, events and birthdays. Easily filter the information you would like to see. OneCalendar works on Windows 8

22 Alternatives To One Calendar

CalenGoo

Features | 1.0.175 for Android™

Calendar

Calendar is a time-management web application by Microsoft.
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Calendar Lock PEA

Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM.
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Desktop Calendar

Keep a nice, transparent calender on the desktop. Double-click on a day to enter a description.
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GMinder

GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
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GNOME Calendar

GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME…

Kolab Community

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

Lightning Calendar

Organize your life — it’s about time!
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Nextcloud Calendar

The Calendar app is a user interface for Nextcloud’s CalDAV server.
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Outlook

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Polar Liquoo

Polar Liquoo is a powerfull calendar software !

Rainlendar

Rainlendar - Customizable desktop calendar

SSuite My Calendar Diary

A portable calendar and diary for people on the move…

Simple Calendar

A simple calendar with events (optional recurring and reminders), week numbers and a customizable…

VueMinder Calendar

Take control of your schedule and get reminded wherever and however you want.
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Zoho Calendar

Zoho Calendar is a business calendar that comes along with the Zoho Mail suite of applications. Make your schedules click by effortlessly managing events with Zoho Calendar.
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eM Client

eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.