Software
We've compiled a list of 15 free and paid alternatives to Citadel. The primary competitors include Kolab Community, Zimbra Collaboration Suite. In addition to these, users also draw comparisons between Citadel and hMail Server, MDaemon Messaging Server, Zarafa. Also you can look at other similar options here: Office and Productivity Software.
We've compiled a list of 15 free and paid alternatives to Citadel. The primary competitors include Kolab Community, Zimbra Collaboration Suite. In addition to these, users also draw comparisons between Citadel and hMail Server, MDaemon Messaging Server, Zarafa. Also you can look at other similar options here: Office and Productivity Software.
Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
Low cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for...
Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile...
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
SophiMail is a fully-featured email and collaboration server solving the most critical email...
Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.
Is a collaboration suite (messaging and groupware).
Is a collaboration suite (messaging and groupware).
Linux
Web-Based
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 platform for the Internet, the Citadel/UX developers added functionality such as shared calendars, instant messaging, and built-in implementations of Internet protocols such as SMTP, IMAP, Sieve, POP3, GroupDAV and XMPP. All protocols offer OpenSSL encryption for additional security.
Users of Citadel/UX systems also have available to them a web-based user interface which employs Ajax style functionality to allow application-like interaction with the system.
Citadel uses the Berkeley DB database for all of its data stores, including the message base.
Chat
Real time collaboration
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