Citadel – open source messaging and collaboration platform

Citadel is an open source messaging and collaboration suite that offered various useful tools such as Email, calendaring/scheduling , address books, bulletin boards, mailing list server , instant messaging, wiki and multiple domain support all those tool are available under powerful web user interface.

Citadel-collaboration-platform

With Citadel, user can work together and stay in touch without calling attention to itself. it is instantly install without need to manually integrate all the different components together. A unique architecture make him a versatile software. In order to modernize the Citadel platform for the Internet, the Citadel/UX developers added functionality such as a text-based interface, an AJAX-style web interface, and many popular PIM clients using SMTP/POP/IMAP. All of these can be used simultaneously and also extremely scalable.

Features of Citadel

  1. Email, calendaring, address books, bulletin boards, instant messaging, and more … all in one tightly integrated server package.
  2. High-performance, multiprotocol, multithreaded server engine
  3. Web browser, telnet/SSH, local client software accessible
  4. Standards-compliant e-mail built in: IMAP, POP3, ESMTP
  5. Group calendaring and scheduling (GroupDAV and Kolab-1 compatible)
  6. Built-in listserv (mailing list server)
  7. Integrated server-side mail sorting and filtering. Users can choose between an easy-to-use web based rules editor, or the power of writing complex scripts using the industry standard Sieve language.
  8. Support for push e-mail and mobile devices
  9. Database-driven, single-instance message store
  10. Built-in full text index for fast searching
  11. Authenticated SMTP for remote email submission
  12. Support for Multiple domain
  13. Built-in integration with perimiter email filtering technologies such as Real time Blackhole Lists (RBL’s), SpamAssassin, and ClamAV antivirus.
  14. Server-to-server replication.
  15. Web-based access to email, calendars, and everything else through a powerful AJAX-style front end
  16. Built-in instant messenger service
  17. Provide SSL/TLS encryption for all protocols
  18. Truly open source projects released under GNU General Public License (GPL3).

Download : Citadel

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