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).

    The list of alternatives was last updated May 17, 2021

    Platforms

    • Online
    • Windows
    • Android
    • Linux
    • iPhone
    • Mac
    • Android Tablet
    • iPad
    • Self-Hosted
    • Software as a Service (SaaS)
    • Windows Phone
    • Google Chrome
    • Windows S
    • Blackberry
    • BSD
    • Symbian S60
    • Kindle Fire
    • Blackberry 10
    • Android Wear
    • Thunderbird

    Features

    • Calendar
    • Todos
    • Scheduling
    • Apps that Sync with Google Calendar
    • Planner
    • Portable
    • Calendar Sync
    • Scheduler
    • CalDAV
    • Task Management
    • Shared calendars
    • Reminders
    • Privacy focused
    • Booking calendar
    • Contacts
    • Customizable
    • Agenda
    • Ad-free
    • Multiple languages
    • Online booking

    License

    × Clear
    • Free
    • Open Source
    • Paid
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    Showing 10 of 22 alternatives