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Horde GroupwareBaïkal
Free

Free and open source with no paid tier.

 Free

Free and open source under the GPL v3.

Web, Self-hosted Self-hosted
  • Full groupware suite beyond mail, including tasks, notes and time tracking
  • CalDAV, CardDAV and ActiveSync sync
  • Runs on any basic PHP host
  • Web interface for users, calendars and address books
  • Requires running and maintaining a PHP server
  • Older codebase with a long history of security fixes to track
  • No built-in calendar or contacts web client for end users
  • Docker installation is only unofficial
Self-hosted Self-hosted
Open source Open source
License: LGPL/GPL License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 24, 2026

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