Horde

Horde Groupware is a free, enterprise ready, browser based collaboration suite.

19 Alternatives To Horde

Cypht

All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.
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G Suite

Google’s encompassing suite of cloud-based business apps.

Kolab Community

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

Mail-in-a-box

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Mailpile

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.

NeutronMail

Self-hosted server for the ProtonMail client.
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Outlook

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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ProtonMail

Secure email with absolutely no compromises. Get your free encrypted email account today.

Rainloop

RainLoop is a web based email client.

Roundcube

Web-based IMAP email client

SOGo

SOGo is groupware server with a focus on scalability and open standards.

Squirrelmail

SquirrelMail is a standards-based webmail package written in PHP.
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Turing Email

Turing. Modern email has arrived. Turing Email supports email providers including Google Apps, Outlook, Yahoo Mail, iCloud Mail, and AOL Mail. Join our exclusive network.
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Webmail Lite

Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server applicatio…

Zimbra

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
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Zoho Mail

Zoho Mail is a webmail service built with the needs of a modern business in mind.

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).

mailcow dockerized

An open source mailserver suite.