jenova is the say2 server (used to be "sephiroth").
mud-server is a gateway server for tf (or other mud-client) users.

mochi is the java gui client by greg "e" brown.

meko is the gtk+ gui client by scott james remnant.

both jenova and mud-server REQUIRE libsay2 to build.  you don't have
to install libsay2 if you don't want to -- if you build libsay2 from the
same folder level as you build jenova and/or mud-server, they'll find
it.

say2pl-*.tgz is a snapshot of the say2 perl client, which looks somewhat
like ircII and uses curses.  to use it, you need the perl curses module,
conveniently mirrored here.