Alternatives to OX Open-Xchange for all platforms with any license

Roundcube

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...

Free Open Source Self-Hosted PHP Cloudron
Hostable PGP Encryption Add a feature

142 Like
Kolab Community

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

Freemium Open Source Linux Web Self-Hosted
CalDAV CardDAV Real time collaboration Support for WebDAV Add a feature

37 Like
SOGo

SOGo is groupware server with a focus on scalability and open standards. SOGo provides a rich AJAX-based Web interface and supports multiple native clients through...

Free Open Source Linux Web Thunderbird Cloudron
CalDAV CardDAV Support for Multiple Users Add a feature

28 Like
Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra...

Commercial Linux Web
Active Directory integration ActiveSync Email Server Real time collaboration ... Team Collaboration Add a feature

28 Like
Citadel

Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD. In order to modernize the Citadel...

Free Open Source Linux Web
Real time collaboration Add a feature

6 Like
Microsoft Exchange Server

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is...

Commercial Windows Web
Email Server Real time collaboration Add a feature

16 Like
Axigen

Axigen provides a multi-tenant, fully integrated, multi-platform, all-in-one email, calendaring and collaboration messaging solution. It grants extensive branding...

Commercial Mac Windows Linux BSD Self-Hosted ... Microsoft Office Outlook
Api API Integration CalDAV CardDAV ... Delegated Administration Support for Docker Email Server Multiple languages Real time collaboration Shared folders White-labeled Add a feature

10 Like
iMail

Fast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited...

Free Windows Self-Hosted
Email Server Add a feature

3 Like
SophiMail

SophiMail is a fully-featured email and collaboration server solving the most critical email issues: maximizes Privacy, Portability and Cost efficiency, Admin & User...

Commercial BSD VirtualBox Self-Hosted VMware vSphere Hypervisor Software as a Service (SaaS)
Daily Backup Indexed search Backup CalDAV ... CardDAV Data portability Encrypted Email Email Server Privacy focused Private messaging Schedule Backup Security focused Selective folder sharing Server Monitoring Shared folders Team Collaboration Two factor authentication Unlimited users Add a feature

7 Like
Sanwhole Exchange

Sanwhole Exchange is a server running iMail, iPress and iStore services. iMail is an enterprise-class email server does Microsoft Exchange and Gmail work. iPress sets...

Commercial $ $ $ Windows
Email Server Add a feature

1 Like
OBM

OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.

Free Open Source Mac Windows Linux
CalDAV Email Server Real time collaboration Add a feature

3 Like
atmail

Atmail allows you to choose between on-premises or cloud deployment. Features include email, contact, calendar, task, storage, synchronisation and provisioning. ...

Commercial Mac Windows Linux Android iPhone ... Android Tablet iPad
On-premises software Software as a Service Add a feature

1 Like
Expanding Communication

Turnkey Solutions for the Enterprise Cloud Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file...

Commercial Linux
CalDAV Email Server Add a feature

5 Like
eGroupWare

Egroupware is a web based software for team collaboration, central data management and CRM: email client, online calendar, contact and task management, project and file...

Commercial Open Source Linux Web
No features added Add a feature

7 Like
SmarterMail

SmarterMail offers many of the same features as Microsoft Exchange but has lower hardware requirements and reduced maintenance costs, resulting in a significantly lower...

Commercial $ $ $ Windows Web Self-Hosted
Email Server Add a feature

1 Like