Apps similar to Apache James include Nextcloud Hub, which is free and open source. Other options are Zimbra Collaboration Suite, OpenChange, CrossBox and OBM. In total there are six Mail Servers like Apache James for Linux, the web, self-hosting, Android and iPhone.
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.
Germany
EU
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.
United States
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
Bosnia & Herzegovina
OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
Australia
