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

138 Like
Kolab Community

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

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

36 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
ActiveSync Real time collaboration Add a feature

28 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 Add a feature

25 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
CalDAV CardDAV Delegated Administration Support for Docker ... Multiple languages Real time collaboration Shared folders White-labeled Add a feature

9 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
Real time collaboration Add a feature

15 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

4 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
No features added Add a feature

2 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 Real time collaboration Add a feature

3 Like
Postaci

Postaci (Turkish for Postman) is multiplatform Webmail software which is database independent, multilanguage, POP3/IMAP, and fully MIME-compatible. While using POP3 mode...

Free Open Source Linux
No features added Add a feature

0 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 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 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...

Free Open Source Linux Web
No features added Add a feature

7 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
Daily Backup Indexed search CalDAV CardDAV ... Data portability Privacy focused Private messaging Schedule Backup Security focused Selective folder sharing Shared folders Team Collaboration Two factor authentication Unlimited users Add a feature

6 Like
Netrepid Hosted Exchange Services

Hosted Exchange solutions from Netrepid - the best hosted exchange provider. Accelerate your technology at on demand speed.

Commercial Web
No features added Add a feature

1 Like