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Horde Groupware vs Roundcube: catalog facts
Horde Groupware	Roundcube
Free Free and open source with no paid tier.	Free Free and open source webmail software.
Web, Self-hosted	Web, Self-hosted
Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync	Application-like webmail interface for any IMAP server Address book with LDAP connectors
Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track	Requires a PHP web server and an existing mail server Only a webmail front end, not a mail server itself
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	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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