Google Workspace AlternativesOnly Open Source apps categorised as Mail Servers

The best open source Mail Server alternative to Google Workspace is Zimbra Collaboration Suite. If that doesn't suit you, our users have ranked more than 50 alternatives to Google Workspace and three of them are open source Mail Servers so hopefully you can find a suitable replacement. Other interesting open source Mail Server alternatives to Google Workspace are Kolab Now and OpenChange.

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Google Workspace alternatives are mainly Mail Servers but may also be Team Collaboration Tools or WebMail Providers. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Google Workspace.

Google Workspace

136

Mail Server
Paid • Proprietary

Google Workspace (formerly Google Apps for Work / G Suite) is a collection of cloud computing, productivity and collaboration tools, software and products developed and marketed by Google. It consists of...

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Google Workspace alternatives page was last updated Jan 15, 2024

Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
43 Zimbra Collaboration Suite alternatives
License model
- Freemium • Open Source
Application types
- Mail Server
- Calendar App
Platforms
- Linux
- Online
- Self-Hosted
Zimbra Collaboration Suite Features
Real time collaboration
ActiveSync
Active Directory integration
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Zimbra Collaboration Suite VS Google Workspace
Is this a good alternative to Google Workspace?

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.
77 Kolab Now alternatives
License model
- Paid • Open Source
Application types
- Calendar App
- Mail Server
Platforms
- Online
- Software as a Service (SaaS)
- DAVdroid
Kolab Now Features
1. Support for Aliases
2. Real time collaboration
3. Privacy focused
4. End-to-End Encryption
5. CalDAV Support
6. WebDAV Sync
7. CardDAV Support
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Kolab Now VS Google Workspace
Is Kolab Now a good alternative to Google Workspace?

OpenChange
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
29 OpenChange alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Linux
OpenChange Features
Exchange
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Discontinued
Last release is from 2015

OpenChange VS Google Workspace
Is OpenChange a good alternative to Google Workspace?