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Horde GroupwareDAViCal
Free

Free and open source with no paid tier.

 Free

Free software under the GNU General Public License.

Web, Self-hosted Linux, Self-hosted
  • Full groupware suite beyond mail, including tasks, notes and time tracking
  • CalDAV, CardDAV and ActiveSync sync
  • Calendar delegation and shared access between users
  • Free/busy scheduling for meetings
  • Requires running and maintaining a PHP server
  • Older codebase with a long history of security fixes to track
  • Requires PostgreSQL and a PHP web server
  • Setup is more involved than lighter CalDAV servers
Self-hosted Self-hosted
Open source Open source
License: LGPL/GPL 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

Checked September 23, 2026

Checked October 2, 2026

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