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Horde GroupwareRadicale
Free

Free and open source with no paid tier.

 Free

Free to run on your own server.

Web, Self-hosted Self-hosted
  • Full groupware suite beyond mail, including tasks, notes and time tracking
  • CalDAV, CardDAV and ActiveSync sync
  • Standard CalDAV and CardDAV support
  • Small and light enough for modest hardware
  • Requires running and maintaining a PHP server
  • Older codebase with a long history of security fixes to track
  • You set up and maintain the server yourself
  • Only handles calendars and contacts, not mail or files
Self-hosted Self-hosted
Open source Open source
License: LGPL/GPL License not stated
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 September 24, 2026

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