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BaïkalHorde Groupware
Free

Free and open source under the GPL v3.

 Free

Free and open source with no paid tier.

Self-hosted Web, Self-hosted
  • Runs on any basic PHP host
  • Web interface for users, calendars and address books
  • Full groupware suite beyond mail, including tasks, notes and time tracking
  • CalDAV, CardDAV and ActiveSync sync
  • No built-in calendar or contacts web client for end users
  • Docker installation is only unofficial
  • 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-3.0 License: LGPL/GPL
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked September 23, 2026

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