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SOGo vs DAViCal: catalog facts
SOGo	DAViCal
Free Free and open source; paid premium support is offered separately.	Free Free software under the GNU General Public License.
Web, Self-hosted	Linux, Self-hosted
Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients	Calendar delegation and shared access between users Free/busy scheduling for meetings
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	Requires PostgreSQL and a PHP web server Setup is more involved than lighter CalDAV servers
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License: GPL-2.0
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.