Cafe is a modified Citadel/UX. See Citadel/UX for description

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From: news@wolves.durham.nc.us (G. Wolfe Woodbury)
Date: Sat Jan 15 19:36:41 EST 1994
Subject: Citadel
Ftp-Site: ftp://sunsite.unc.edu/pub/Linux/system/BBS/bbs/*

Citadel                 various                 source generally available
                                                some versions have news
        
        Citadel is a whole world unto itself.  Citadel code is/was
widely available, and it has been ported to may different platforms and
environments.  From PC-clones, to the Amiga, to Unix, they all tend to
work the same way.

        Citadel uses a slightly different organizing metaphor.  There
are rooms which may contain messages, files and bulletins (in any
combination.)  You move from room to room and read the messages or
browse the file lists.  You can "forget" rooms to unsubscribe, and there
can be multiple operators on a Citadel system (sub-ops.)

        Finding Citadel is problematical, I've been singularly
unsuccessful in several attempts (even using archie.)
Quartz.rutgers.edu may be the best bet.

        (Authors of specific Citadel [Unix based] packages are invited
        to write and gain fame and fortune in this FAQ!)