There were fees from 2007 to 2013, but not in every state and they were miniscule compared to other countries (500€ per semester). Even that got thrown out.
Now there's just the usual administrative fee, as Milch said. The most valuable part of that is the "Semester Ticket", i.e. socialized public transportation. You can opt out if you really don't want to pay it, though you'd be stupid to, since it's a really great deal to be able to hop on any train, tram or bus at no additional cost (state wide usually, depends on the agreements the Uni made). Mine was around 230€ or so, I forget. Insane deal, considering I would have to pay as much for a
monthly train ticket right now just to get to my alma mater.