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philosophical imaginary

Powerful and flexible

Citadel is easy, versatile, and powerful, thanks to its exclusive "rooms" based architecture. No other platform seamlessly combines so many different features using this familiar and consistent metaphor.
Packed with features
  • email
  • calendar/scheduling
  • address books
  • bulletin boards (forums)
  • mailing list server
  • instant messaging
  • wiki and blog engines
  • multiple domain support
  • a powerful web interface
  • rss aggregation
  • see the full feature list...
True open source

Citadel is 100% open source software using the GNU General Public License. It's not a crippled, cut-down version of some expensive "enterprise" edition. The software you download here is the very best available, and it's all free software.

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