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Nextcloud Calendar

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

20 Alternatives To Nextcloud Calendar

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Apple Mail

There’s big news attached.
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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.

Calendarific

Calendarific is a global holiday JSON API and event management & intelligence platform.

ChronoFlo Calendar

ChronoFlo Calendar allows you to make beautiful interactive calendars that you can share on the web.

Cozi

Cozi | Must-have app for the modern family

DAKboard

A wifi connected wall display for your photos, calendar, news, weather and to-do.

Desktop-Reminder

Desktop-Reminder is a freeware task planner for Windows to manage your tasks and other to-dos’ in really easy way.

Etar

Material design open source calendar for Android.
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Google Calendar

Spend less time managing your day & more time enjoying it

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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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.
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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.

Rainlendar

Rainlendar - Customizable desktop calendar

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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XNote Stopwatch

Try the most feature-rich stopwatch and timer software on the net for free!

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.

fruux

Free service that takes care of your contacts, calendars and more so you don’t have to.

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).