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Roundcube vs Horde Groupware: catalog facts
Roundcube	Horde Groupware
Free Free and open source webmail software.	Free Free and open source with no paid tier.
Web, Self-hosted	Web, Self-hosted
Application-like webmail interface for any IMAP server Address book with LDAP connectors	Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync
Requires a PHP web server and an existing mail server Only a webmail front end, not a mail server itself	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
Needs internet	Not stated if it works offline
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.