Open Source Google Calendar Alternatives

    The best open source alternative to Google Calendar is Etar, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Google Calendar and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Calendar are Calendar Lock PEA (Free, Open Source), Lightning Calendar (Free, Open Source), Simple Calendar (Freemium, Open Source) and Nextcloud Calendar (Free, Open Source).

    This page was last updated Jul 6, 2021

    1. Contacts keeps and organize your contacts information. You can create, edit, delete and link together pieces of information about your contacts. Contacts aggregates the details from all your sources providing a centralized place for managing your contacts.
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    2. WebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors.
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      WebCalendar vs Google Calendar opinions
      pros, cons and recent comments
      KuboFHromoslav If you want self-hosted web-based callendar software for multiple people, WebCalendar is great option! Although, it is not so feature rich and user friendly as Google Calendar is (e.g. adding events across multiple days need to be dane by manually calculating it in _hours_) and have problems with internationalization (buggy showing of accented letters).
      Positive comment about 4 years ago

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      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Self-Hosted
      Small and medium scale businesses wish to provide online service booking, but tools out there are either too expensive or too complex.

      Discontinued

      Project is archived now: https://github.com/timegridio/timegrid

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    3. BORG is a combination calendar and task tracking system. The calendar supports all sorts of appointments and also a simple todo list. The calendar functionality is similar to that of other PIMs, such as Microsoft Outlook, Mozilla Calendar, Palm Desktop, Yahoo Calendar, etc...
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    4. Free and open-source Persian Calendar with Compass/Qibla and Athan, and Afghanistan holidays, Dari, Kurdish, Arabic and Pashto support. Supports Gregorian and Islamic calendars support also. Works with TalkBack accessibility feature of Android also.
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    5. California is a calendar built for GNOME 3. It allows you to view and manage your online calendars with a simple and modern interface.

      Discontinued

      Last release 0.4.0 is from March 2015.

    6. Remind is a sophisticated calendar and alarm program. It includes the following features: - A sophisticated scripting language and intelligent handling of exceptions and holidays. - Plain-text, PostScript and HTML output. - Timed reminders and pop-up alarms.
      Remind vs Google Calendar opinions
      pros, cons and recent comments
      A free and open source, UNIXy alternative that works from the terminal.
      Positive comment about 5 years ago

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    7. qOrganizer is a general organizer that includes a calendar with schedule,reminders,journal/notes for every day, to-do list. But provides features useful for students such as:timetable and a booklet for marks and absences.It's designed to be easy to use.

      Discontinued

      The project is no longer developed. Last version, 3.1.5, released in August 2010, can be still downloaded from SourceForge.

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    8. A responsive jquery calendar scheduler built with bootstrap and moment.js.
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    9. wtplan (web terminal planner ) helps you manage a calendar. The calendar can be managed from a command line interface and/or a web interface. The calendar data is stored in a simple text file.
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    Showing 20 of 22 alternatives