Citadel/UX
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Citadel (specifically, Citadel/UX) is a variant of the Citadel family of programs which became popular in the 1980s and 1990s as a bulletin board system platform. It is designed to run on open source operating systems such as Linux or BSD. Although it is still being used widely on bulletin board systems, in 1998 the developers began to expand its functionality to a general purpose groupware platform.
The developers of Citadel/UX now refer to the project simply as "Citadel," based on the assertion that it is the only active Citadel project. Some have seen this is controversial, however, as some Citadel BBS software projects are still active.
Citadel uses the Berkeley DB database for all of its data stores, including the message base.
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, POP3, and GroupDAV. All protocols are OpenSSL encryption-enabled for security reasons.
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.
The software is open source, and released under the GPL license.
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