A bit of duplication here. excite.de, acoon.de and freenet.de base their directories from dmoz (of which dmoz.de is an entry page not an independent directory). lycos.de and allesklar.de use the same (different) directory.
There is also an 'official' directory, run by the federal government, at [deutschland.de...] . It seems to be quite selective, restricted to informational as opposed to commercial content.