deborphan | program that can find unused packages, e.g. libraries | Mehr ...
deborphan finds "orphaned" packages on your system. It determines which packages have no other packages depending on their installation and shows you a list of these packages. It is most useful when finding libraries, but it can be used on packages in all sections. . This package also includes orphaner, a text menu frontend to deborphan. Please install the recommended packages dialog, gettext-base and apt when you want a working and fully featured orphaner.