Open Source Zimbra Collaboration Suite AlternativesMail Servers & Team Collaboration Tools like Zimbra Collaboration Suite

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 Nextcloud Hub, mailcow: dockerized, Kolab Community and Carbonio.

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

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Zimbra Collaboration Suite alternatives page was last updated Feb 6, 2025
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  1. Roundcube icon

    Roundcube

     167 likes
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    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.

    26 Roundcube alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • CH flagSwitzerland

    Platforms

    • Self-Hosted
    • PHP
    • Cloudron
    Roundcube screenshot 1

    Roundcube Features

    1.  WYSIWYG Support
    2.  PGP Encryption
    3.  Dark Mode
    4.  IMAP Support
    5.  Hostable

    Roundcube VS Zimbra Collaboration Suite

     
    Comments about Roundcube as an Alternative to Zimbra Collaboration Suite
    Guest
    Negative •Mar 15, 2018
    25

    Roudcube is only web mail client not groupware solution like Zimbra

    Zimbra Collaboration Suite Icon
    Roundcube icon

    • This alternative is disputed. Roundcube is a legitimate Zimbra Collaboration Suite alternative, but it might have issues that some users think are important.

    • Roundcube is the most popular Self-Hosted alternative to Zimbra Collaboration Suite.

    • Roundcube is the most popular Open Source alternative to Zimbra Collaboration Suite.

    • Roundcube is Free and Open SourceZimbra Collaboration Suite is Freemium and Open Source
  2. Nextcloud Hub icon

    Nextcloud Hub

     21 likes
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    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.

    51 Nextcloud Hub alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Self-Hosted
    Nextcloud Hub screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Ad-free
    2.  Real time collaboration
    3.  Extensible by Plugins/Extensions
    4.  Cloud Sync
    5.  Photo Gallery

    Nextcloud Hub VS Zimbra Collaboration Suite

     
  4. mailcow: dockerized icon

    mailcow: dockerized

     42 likes
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    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.

    22 mailcow: dockerized alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Linux
    • Self-Hosted
    mailcow: dockerized screenshot 1

    Top mailcow: dockerized Features

    1.  Mail Server
    2.  Self hosted mail
    3. Docker icon  Support for Docker
    4.  ActiveSync
    5.  Dark Mode
    6.  Ad-free
    7.  Two-factor Authentication
    8.  Mail Filtering
    9.  Email Organizer
    10.  Spam Filter
    11.  Support for Aliases
    12.  Modular System

    mailcow: dockerized VS Zimbra Collaboration Suite

     
  5. Kolab Community icon

    Kolab Community

     41 likes
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    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.

    47 Kolab Community alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • CH flagSwitzerland

    Platforms

    • Linux
    • Online
    • Self-Hosted

    Kolab Community Features

    1.  Real time collaboration
    2.  Video Conferencing
    3.  Contacts
    4.  Voice Chat
    5.  CardDAV Support
    6.  IMAP Support
    7.  CalDAV Support
    8.  WebDAV Support

    Kolab Community VS Zimbra Collaboration Suite

     
  6. Carbonio icon

    Carbonio

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    Carbonio Community Edition (Carbonio CE) is a free and open-source (FOSS) email and collaboration platform designed by Zextras. It is a complete email solution, allowing organizations to maintain digital sovereignty through on-premises self-hosted servers, ensuring privacy and...

    7 Carbonio alternatives

    License model

    • Free • Open Source

    Country of Origin

    • IT flagItaly
    • European Union flagEU

    Platforms

    • Online
    Carbonio screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Real time collaboration
    2.  End-to-End Encryption
    3.  PGP Encryption
    4.  Full-Text Search
    5.  Email Scheduling
    6.  Calendar Integration
    7.  Mail Filtering
    8.  Recurring Tasks
    9.  Email Organizer
    10.  Reminders
    11.  Ad-free
    12.  Dark Mode

    Carbonio VS Zimbra Collaboration Suite

     
  7. grommunio icon

    grommunio

     3 likes
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    grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.

    12 grommunio alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Self-Hosted
    grommunio screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Real time collaboration
    2.  Contacts
    3.  Self hosted mail
    4.  RPC
    5.  Ad-free
    6.  Dark Mode
    7.  Spam Filter
    8. Docker icon  Support for Docker
    9.  CardDAV Support
    10.  IMAP Support
    11.  CalDAV Support
    12.  POP3 Support

    grommunio VS Zimbra Collaboration Suite

     
  9. Horde icon

    Horde

     29 likes
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    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.

    42 Horde alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    Horde screenshot 1
    Discontinued

    The last release (5.2.22) was in September 2017.

    Horde Features

    1.  CalDAV Support

    Horde VS Zimbra Collaboration Suite

     
  10. Kolab Now icon

    Kolab Now

     42 likes
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    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.

    License model

    Application types

    Country of Origin

    • CH flagSwitzerland

    Platforms

    • Online
    • Software as a Service (SaaS)
    • DAVx5
    Kolab Now email

    Properties

    1.  Privacy focused

    Features

    1.  Support for Aliases
    2.  Real time collaboration
    3.  End-to-End Encryption
    4.  CalDAV Support
    5.  WebDAV Sync
    6.  CardDAV Support

    Kolab Now VS Zimbra Collaboration Suite

     
  11. OX App Suite icon

    OX App Suite

     15 likes
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    The OX App Suite by Open-Xchange is web-based platform offering a suite of apps like an email client, calendar, contacts magement, cloud storage with synchronization and productivity apps for word processing, spreadsheets and presentations.

    19 OX App Suite alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Linux
    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    OX Portal

    OX App Suite Features

    1.  Real time collaboration
    2.  Cloud Sync
    3.  Calendar Integration
    4.  Personal Information Manager (PIM)
    5.  Group Mail
    6.  WebDAV Support
    7.  WebDAV Sync

    OX App Suite VS Zimbra Collaboration Suite

     
  12. iRedMail icon

    iRedMail

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

    Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support.

    Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.

    Works on both no.

    67 iRedMail alternatives

    License model

    • Freemium • Open Source

    Application type

    Platforms

    • Linux
    • BSD
    • Self-Hosted
    Main components and working process

    iRedMail VS Zimbra Collaboration Suite

     
  13. OpenChange icon

    OpenChange

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

    License model

    • Free • Open Source

    Application type

    Platforms

    • Linux
    Discontinued

    Last release is from 2015

    OpenChange Features

    1.  Exchange

    OpenChange VS Zimbra Collaboration Suite

     

  14. Citadel

     7 likes
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    Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD. In order to modernize the Citadel platform for the Internet, the Citadel/UX developers added functionality such as shared calendars, instant...

    License model

    • Free • Open Source

    Application types

    Platforms

    • Linux
    • Online

    Citadel Features

    1.  Real time collaboration

    Citadel VS Zimbra Collaboration Suite

     
12 of 19 Zimbra Collaboration Suite alternatives