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Open Source Zimbra Collaboration Suite Alternatives

The best open source alternative to Zimbra Collaboration Suite is Roundcube. If that doesn't suit you, our users have ranked more than 25 alternatives to Zimbra Collaboration Suite and 19 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Zimbra Collaboration Suite are mailcow: dockerized, Horde, Nextcloud Hub and Kolab Community.

Zimbra Collaboration Suite alternatives are mainly Mail Servers but may also be WebMail Providers or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Zimbra Collaboration Suite.
This page was last updated Oct 25, 2021
  • FreemiumOpen Source
  • Linux
  • Online
  • Self-Hosted

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

Learn more about Zimbra Collaboration Suite

  1. Roundcube icon

    Roundcube

    • FreeOpen Source
    • Self-Hosted
    • PHP
    • Cloudron

    Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking.

    Screenshot
    Roundcube vs Zimbra Collaboration Suite opinions
    This alternative is disputed. Roundcube is still a legitimate alternative to Zimbra Collaboration Suite, but it might have issues that some users think are important.

    Roudcube is only web mail client not groupware solution like Zimbra

    Negative comment over 4 years ago
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    If this Comment contains spam or other abuse, notify admins about it.

    25
  2. mailcow: dockerized icon

    mailcow: dockerized

    • FreeOpen Source
    • Linux
    • Self-Hosted

    mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.

    Screenshot


  3. Horde icon

    Horde

    • FreeOpen Source
    • Online
    • Self-Hosted

    Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.

    Discontinued

    The last release (5.2.22) was in September 2017.

    Screenshot
  4. Nextcloud Hub icon

    Nextcloud Hub

    • FreeOpen Source
    • Self-Hosted

    Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.

    No screenshots yet
  5. Kolab Community icon

    Kolab Community

    • FreemiumOpen Source
    • Linux
    • Online
    • Self-Hosted

    Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.

    No screenshots yet


  6. Kopano icon

    Kopano

    • FreemiumOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • Windows Phone
    • iPad
    • Self-Hosted
    • Microsoft Office Outlook
    • S/MIME
    • Software as a Service (SaaS)

    Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.

    Screenshot
  7. Kolab Now icon

    Kolab Now

    • Online
    • Software as a Service (SaaS)
    • DAVdroid

    Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.

    Kolab Now email
  8. iRedMail icon

    iRedMail

    • FreemiumOpen Source
    • Linux
    • BSD
    • Self-Hosted

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

    Main components and working process
  9. OpenChange icon

    OpenChange

    • FreeOpen Source
    • Linux

    OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.

    No screenshots yet
  10. Blue Mind is a complete solution of company messaging, calendars and collaborative work. It aims to enable you to work daily with comprehensive, useful, efficient and effective tools.

    Webmail
Showing 10 of 19 alternatives