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What is the difference between Citadel and Citadel/UX?

None, anymore.

During the heyday of the dialup BBS, there were many different implementations of software called "Citadel" which provided a similar feature set and command set. Our variant was called "Citadel/UX" because it runs on Unix and Unix-like operating systems.

Our implementation is the only one which evolved into a modern groupware and content management suite, and accounts for nearly all of the mindshare when such things are discussed on the Internet. As of this writing it is the only Citadel implementation still being actively maintained. Therefore, on this web site we refer to it simply as Citadel.

There are no social media links here. Enjoy a friendly Citadel community instead. Or go outside.