Roundcube

Web-based IMAP email client

20 Alternatives To Roundcube

Afterlogic Webmail

Webmail is an open-source webmail script for existing IMAP servers.
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Gmail

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

Horde

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

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.

Microsoft Exchange Server

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

Mu4e

Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.

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.

SOGo

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

Squirrelmail

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

Tutanota

Get your encrypted mailbox for free.

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.