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

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.

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Zimbra Collaboration Suite

Freemium • Open Source
Mail Server

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

Roundcube
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Free • Open Source
WebMail Provider
Email Client
Self-Hosted
PHP
Cloudron
28 alternatives to Roundcube
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.
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Roundcube Features
1. WYSIWYG SupportRoundcube integrates a WYSIWYG editor to edit the look and content of a document, page, or file.
2. PGP EncryptionRoundcube supports PGP, an encryption system used for sending encrypted emails and files.
IMAP Support
Hostable
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.
Guest
Roudcube is only web mail client not groupware solution like Zimbra
Negative comment•
25
Nextcloud Hub
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Yes
No
Free • Open Source
Team Collaboration Tool
Calendar App
Self-Hosted
53 alternatives to Nextcloud Hub
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.
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Nextcloud Hub Features
1. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
2. Ad-freeNextcloud Hub doesn't contain any form of external advertising.
3. Real time collaborationMultiple users can work together in Nextcloud Hub simultaneously.
4. Extensible by Plugins/ExtensionsNextcloud Hub can be extended with add-ons, plugins and extensions.
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mailcow: dockerized
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Yes
No
Free • Open Source
Mail Server
WebMail Provider
Linux
Self-Hosted
18 alternatives to mailcow: dockerized
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.
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mailcow: dockerized Features
1. Dark Modemailcow: dockerized supports dark mode for comfortable usage in low light conditions.
2. Ad-freemailcow: dockerized doesn't contain any form of external advertising.
3. Two-factor Authenticationmailcow: dockerized supports two-factor authentication (2FA).
4. Mail Filteringmailcow: dockerized classifies email messages according to specified criteria, allowing you to automatically recognize fraudulent or spam messages.
5. Email Organizermailcow: dockerized allows you to take control of your inbox by filtering and control tools.
6. Spam Filtermailcow: dockerized can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
7. Support for Aliasesmailcow: dockerized supports aliases, so you can receive email without exposing your main email address
Self hosted mail
Support for Docker
ActiveSync
Modular System
Dockerized
Kolab Community
Do you think this is a good alternative?
Yes
No
Freemium • Open Source
Linux
Online
Self-Hosted
43 alternatives to Kolab Community
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.
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Kolab Community Features
1. Real time collaborationMultiple users can work together in Kolab Community simultaneously.
CalDAV Support
WebDAV Support
IMAP Support
CardDAV Support
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Horde
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Yes
No
Free • Open Source
WebMail Provider
Online
Self-Hosted
40 alternatives to Horde
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.
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Horde Features
CalDAV Support
Discontinued
The last release (5.2.22) was in September 2017.
Kolab Now
Do you think this is a good alternative?
Yes
No
Paid • Open Source
Calendar App
Mail Server
Cloud Storage Service
Online
Software as a Service (SaaS)
DAVdroid
78 alternatives to Kolab Now
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.
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Kolab Now Features
1. Support for AliasesKolab Now supports aliases, so you can receive email without exposing your main email address
2. Real time collaborationMultiple users can work together in Kolab Now simultaneously.
3. Privacy focusedKolab Now is considered a privacy friendly alternative.
4. End-to-End EncryptionKolab Now has E2E Encryption, for entire or parts of the app.
CalDAV Support
WebDAV Sync
CardDAV Support
Kopano
Do you think this is a good alternative?
Yes
No
Paid • Open Source
Mail Server
Email Client
Mobile Device Management (MDM) Tool
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
Windows Phone
iPad
Self-Hosted
Microsoft Office Outlook
S/MIME
Software as a Service (SaaS)
25 alternatives to Kopano
Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.
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Kopano Features
1. Real time collaborationMultiple users can work together in Kopano simultaneously.
On-premises software
Shared Calendar
CalDAV Support
IMAP Support
S/MIME Support
POP3 Support
OX App Suite
Do you think this is a good alternative?
Yes
No
Free • Open Source
Mail Server
WebMail Provider
Calendar App
Linux
Online
Self-Hosted
Software as a Service (SaaS)
20 alternatives to OX App Suite
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.
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OX App Suite Features
1. Real time collaborationMultiple users can work together in OX App Suite simultaneously.
2. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
3. Calendar IntegrationOX App Suite lets you sync your tasks and events with your calendar application.
Personal Information Manager (PIM)
Group Mail
German
WebDAV Support
WebDAV Sync
OpenChange
Do you think this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Linux
30 alternatives to OpenChange
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
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OpenChange Features
Exchange
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Blue-Mind
Do you think this is a good alternative?
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No
Paid • Open Source
Mail Server
WebMail Provider
Calendar App
Linux
10 alternatives to Blue-Mind
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.
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Blue-Mind Features
ActiveSync
Calendar Sync
Reduce mobile data usage
REST API