Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Best Horde Alternatives ranked by AI · updated May 2025
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Horde is a free and open-source web-based groupware. It includes various modules like email, calendar, task management, file sharing, and more.
Price: Free
🎯 horde.org/apps/groupware
Top 6 Horde alternatives
Nextcloud is a self-hosted file sync and share server designed to be easy to use and secure.
Pros
- Easy to use
- Strong security features
- Rich collaboration tools
Cons
- Can be resource-intensive
- Limited integration options
Free and paid plans available
Roundcube is a browser-based multilingual IMAP client with an application-like user interface.
ProtonMail is an end-to-end encrypted email service based in Switzerland.
Free tier available, premium plans starting at $5/month
Google Workspace is a suite of cloud computing, productivity and collaboration tools, software and products developed by Google.
Starting from $6/user/month
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
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