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Radicale vs Horde Groupware: catalog facts
Radicale	Horde Groupware
Free Free to run on your own server.	Free Free and open source with no paid tier.
Self-hosted	Web, Self-hosted
Standard CalDAV and CardDAV support Small and light enough for modest hardware	Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync
You set up and maintain the server yourself Only handles calendars and contacts, not mail or files	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 not stated	License: LGPL/GPL
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
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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