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XandikosRadicale
Free

Free and open source under the GPL-3.0 licence.

 Free

Free to run on your own server.

Linux, Self-hosted Self-hosted
  • Git-backed storage with change history
  • Broad, documented standards coverage
  • Standard CalDAV and CardDAV support
  • Small and light enough for modest hardware
  • No built-in web interface for managing calendars
  • WebDAV LOCK operations not implemented
  • 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: GPL-3.0 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 October 2, 2026

Checked September 24, 2026

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