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SOGo vs Davis: catalog facts
SOGo	Davis
Free Free and open source; paid premium support is offered separately.	Free Free and open source under the MIT licence.
Web, Self-hosted	Web, Self-hosted
Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients	Web dashboard for users, calendars and address books IMAP and LDAP authentication options
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	Requires PHP 8.2 or later and a database Single main maintainer
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.