133 Like Roundcube Good alternative? YES NO 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
34 Like Kolab Community Good alternative? YES NO 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
26 Like SOGo Good alternative? YES NO 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
24 Like Zimbra Collaboration Suite Alternative? YES NO Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra... Freemium Linux Web Real time collaboration Add a feature
15 Like Microsoft Exchange Server Alternative? YES NO 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
4 Like Citadel Good alternative? YES NO 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
8 Like Axigen Good alternative? YES NO 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 Multiple languages Real time collaboration Shared folders ... White-labeled Add a feature
3 Like OBM Good alternative? YES NO 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
7 Like eGroupWare Good alternative? YES NO 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
5 Like Expanding Communication Alternative? YES NO 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
1 Like atmail Good alternative? YES NO 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
0 Like Postaci Good alternative? YES NO 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
1 Like iMail Good alternative? YES NO 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
5 Like SophiMail Good alternative? YES NO SophiMail is a fully-featured email and collaboration server solving the most critical email issues: maximizes Privacy, Portability and Cost efficiency, Admin & User... Free BSD VirtualBox Self-Hosted KVM (Kernel-based Virtual Machine) HyperVM Citrix XenServer VMware vSphere Hypervisor FreeBSD ... Microsoft Hyper-V Server Daily Backup Indexed search CalDAV CardDAV Privacy focused Private messaging ... Schedule Backup Security focused Selective folder sharing Shared folders Team collaboration Two factor authentication Unlimited users Add a feature
1 Like Netrepid Hosted Exchange Services YES NO 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
