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DAViCal vs Horde Groupware: catalog facts
DAViCal	Horde Groupware
Free Free software under the GNU General Public License.	Free Free and open source with no paid tier.
Linux, Self-hosted	Web, Self-hosted
Calendar delegation and shared access between users Free/busy scheduling for meetings	Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync
Requires PostgreSQL and a PHP web server Setup is more involved than lighter CalDAV servers	Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	License: LGPL/GPL
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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