Apps similar to Zimbra Collaboration Suite include Microsoft 365 Copilot, which has a free version. Other options are Google Workspace, Roundcube, eigen and mailcow: dockerized. Mail Servers like Zimbra Collaboration Suite are a crowded field, with more than 50 alternatives for the web, Linux, self-hosting, Windows and Mac.
Afterlogic Aurora is an enterprise collaboration system for small and medium-sized business. Aurora provides collaboration of webmail, contacts, calendar, files and helpdesk modules.
United States
HyperOffices is a Microsoft Exchange alternative with all the messaging features growing business need - custom business email; Outlook email; shared Outlook contacts, calendars and tasks; web and mobile email; Outlook synchronization; shared calendars, contacts, tasks and...
Australia
Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).
Virtual Office, Online Office, Digital Learning Space, Online Groupware - ContactOffice, Keep a virtual office on the web. Share documents, contacts, calendar, tasks, ... with clients, students, suppliers, friends or family.
Belgium
EU
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
Australia
OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.
Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included.
Gridie is an AI-powered spreadsheet automation tool for Excel and Google Sheets that focuses on reusable workflows instead of one-off AI answers.
South Korea
James stands for Java Apache Mail Enterprise Server! It has a modular architecture based on a rich set of modern and efficient components which provides at the end complete, stable, secure and extendable Mail Servers running on the JVM.
Web-based team collaboration suite combining email client, calendar, contact and task tools, CRM, project and file management, file sharing, trouble tickets, Rocket.Chat chat, and Collabora online editing. Offers open source, self-hosted, and SaaS options.
GermanyEU
Established in January 2000, Alinto is one othe principal french editors and operators of collaborative messaging and unified communications. Alinto manages over 4000 areas of professional messaging and more than a million users in 5 countries.
