What is SOGo used for?

SOGo is a scalable groupware suite offering webmail, calendars and address books, with native support for standard clients via IMAP, CalDAV and CardDAV. It is a good fit for hosting groupware for an organization, and offering calendars and contacts to standards-based clients.

Yes. SOGo is open source under the GPL-2.0 licence. Its source code is on GitHub at Alinto/sogo and is written mainly in Objective-C.

Yes. SOGo is open source, so the software itself is free to use.

Can I self-host SOGo?

Yes. SOGo can be self-hosted on your own server or infrastructure.

What is SOGo an alternative to?

SOGo is an open-source alternative to Google Workspace, Microsoft Outlook, Zoho Mail and mailbox.org. Other open-source alternatives to Google Workspace include Stalwart, Mailcow and Mail-in-a-Box.

Is SOGo actively maintained?

Yes. The most recent commit to SOGo was on 2 October 2026. The project has 2.2k stars on GitHub.

SOGo: open-source alternative to Google Workspace

About SOGo

SOGo is an open-source groupware suite that combines calendaring, address book management and a full webmail client, along with resource sharing and permission handling. It is described as fast and scalable, and it is written mainly in Objective-C with an AngularJS Material web interface. It is licensed under GPL-2.0 and developed by Alinto.

Because SOGo relies on documented standards such as IMAP, CalDAV and CardDAV, it provides native connectivity without plugins to many clients, including Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning and many mobile devices. A Thunderbird connector extension for Thunderbird 78 and later is available in a separate repository.

Building SOGo requires the source of both SOGo and SOPE, the underlying application server framework, and a FAQ covers compilation. A dev container is available for development. The project welcomes documentation work, feature requests, mailing list participation, patches and translations, and the README lists official translations in many languages with their maintainers.

Key features

Webmail client
Calendar and address book management
Resource sharing and permission handling
IMAP, CalDAV and CardDAV standards
Native connectivity to Outlook, iCal and iPhone
Thunderbird connector extension

Good fit for

→Hosting groupware for an organization
→Offering calendars and contacts to standards-based clients

Built with: Objective-C
Tags: groupware; webmail; calendar; caldav; carddav; email; self-hosted; collaboration

SOGo: questions and answers

What is SOGo used for?: SOGo is a scalable groupware suite offering webmail, calendars and address books, with native support for standard clients via IMAP, CalDAV and CardDAV. It is a good fit for hosting groupware for an organization, and offering calendars and contacts to standards-based clients.
Is SOGo open source?: Yes. SOGo is open source under the GPL-2.0 licence. Its source code is on GitHub at Alinto/sogo and is written mainly in Objective-C.
Is SOGo free?: Yes. SOGo is open source, so the software itself is free to use.
Can I self-host SOGo?: Yes. SOGo can be self-hosted on your own server or infrastructure.
What is SOGo an alternative to?: SOGo is an open-source alternative to Google Workspace, Microsoft Outlook, Zoho Mail and mailbox.org. Other open-source alternatives to Google Workspace include Stalwart, Mailcow and Mail-in-a-Box.
Is SOGo actively maintained?: Yes. The most recent commit to SOGo was on 2 October 2026. The project has 2.2k stars on GitHub.