General dictionaries
General dictionaries are dictionaries that document contemporary vocabulary and are intended for everyday reference by native and fluent speakers.

The digital dictionary of the German language OBJECT LANGUAGE German METALANGUAGE German GENRE General dictionaries, Portals and aggregators http://www.dwds.de/
Portals and aggregators
Portals and aggregators are websites that provide access to more than one dictionary and allow you to search them all at once.

Online vocabulary system of the German language OBJECT LANGUAGE German METALANGUAGE German GENRE Portals and aggregators http://www.owid.de/
Learners' dictionaries
Learners' dictionaries are intended for people who are learning the language as a second language.

Electronic Learner's Dictionary of German and Italian Dizionario elettronico per apprendenti Italiano-Tedesco LOGIN REQUIRED
OBJECT LANGUAGE German METALANGUAGE Italian GENRE Learners' dictionaries http://eldit.eurac.edu/
Dictionaries on special topics
Dictionaries on special topics are dictionaries that focus on a specific subset of the vocabulary (such as new words or phrasal verbs) or which focus on a specific dialect or variant of the language.

Swiss Idiotikon: Swiss German Dictionary OBJECT LANGUAGE German METALANGUAGE German GENRE Dictionaries on special topics http://www.idiotikon.ch/
Spelling dictionaries
Spelling dictionaries are dictionaries which codify the correct spelling and other aspects of the orthography of words.
Historical dictionaries
Historical dictionaries are dictionaries that document previous historical states of the language.

German dictionary by Jacob Grimm and Wilhelm Grimm OBJECT LANGUAGE German METALANGUAGE German GENRE Historical dictionaries http://dwb.uni-trier.de/de/