OX Open-Xchange

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

16 Alternatives To OX Open-Xchange

Citadel

Is a collaboration suite (messaging and groupware).

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.

Horde

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

Kolab Community

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

MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.

Mailpile

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

Microsoft Exchange Server

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
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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.

Rainloop

RainLoop is a web based email client.

Roundcube

Web-based IMAP email client

Squirrelmail

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

Zimbra Collaboration Suite

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

Zoho is an all-in-one online office suite.

iRedMail

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

mailcow dockerized

An open source mailserver suite.