MUDBOX (MultiUser DataBase Object Xtra)
is a multiuser xtra that allows developers to seamlessly use an external database for all of the DBObject functions. Essentially, MUDBOX replaces Macromedia's DBObject xtra, but implements all of its methods seamlessly.

MUSTARD (MultiUser Server That Accesses Relational Databases)
is a powerful xtra for the multiuser server that allows director applications to easily perform database queries and updates through the multiuser server.