Various dictionaries are available (incl. Duden).

Olms Online is an e-book portal providing access to following collections: * Reprints: About 400 volumes with a focus on German language and literature and on philosophy. Olms Online presents titles with additional information. These are reprints with new introductions, afterwords, notes or indexes added by the editors. * Frankfurt and Leipzig Book Fair Catalogues: Book-trade catalogues, generally referred to as book fair catalogues, offer a unique overview of German and European book production over a period of nearly 300 years (1594-1860).

Databases of terminology and dictionaries can be searched parallely under an unique surface. Big dictionaries (Pons), pocket dictionary (Langenscheidt), dictionaries of law (Becher, Dietl/Lorenz, Doucet/Feck, Potonnier) -- Wörterbücher und Terminologie-Datenbanken können parallel unter einer einheitlichen Oberfläche durchsucht werden. Großwörterbücher (Pons), Taschenwörterbuch (Langenscheidt), Rechtswörterbücher (Becher, Dietl/Lorenz, Doucet/Feck, Potonnier)