Zimbra Collaboration Suite is described as 'Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors' and is an app in the Office & Productivity category. There are more than 25 alternatives to Zimbra Collaboration Suite for a variety of platforms, including Linux, Online / Web-based, Windows, Self-Hosted solutions and Mac. The best alternative is Zoho. It's not free, so if you're looking for a free alternative, you could try Roundcube or mailcow: dockerized. Other great apps like Zimbra Collaboration Suite are Google Workspace (Paid), Microsoft 365 (Paid), Horde (Free, Open Source) and iRedMail (Freemium, Open Source).
Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking.
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Roundcube vs Zimbra Collaboration Suite opinions
This alternative is disputed. Roundcube is still a legitimate alternative to Zimbra Collaboration Suite, but it might have issues that some users think are important.
Roudcube is only web mail client not groupware solution like Zimbra
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.
A fully fledged, free email server solution, an open source project (GPL v2). Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support. Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.