German

Atlasas and Maps: 

• Austrian Maps – Country, city, historical and thematic maps.
• Germany Maps – Country, city, historical and thematic maps.
• Switzerland Maps – Country, city, historical and thematic maps.
• Liechtenstein Map – A very basic country map.
• Berkeley’s Maps Collection
• Periodical Historical Atlas of Europe from AD 1 - AD 2000
• Institut für europäische Geschichte - Historical Maps from the Institute for European History in Mainz

Biographical Resources: 

Neue Deutsche Biographie – Two comprehensive German biographical references (coverage from 1875-present).

Dictionaries:

• PONS – English-German dictionaries from PONS (via Xipolis).
• LEO – Online German-English dictionary from the Technische Universität München.
• Deutsches Wörterbuch – Jacob and Wilhelm Grimm's classic, started in 1838.
• Wörterbuch der hochdeutschen Mundart – Digitized images of Johann Christoph Adelung's 1808 reference work for German (browsable, but not full-text searchable).
• YourDictionary – Online German-English dictionary, plus links to German translation dictionaries in many languages.
• Das Wörterbuch-net - Listing of specialty dictionaries.

Duden Dictionaries:

• Duden: Die deutsche Rechtschreibung  - German Orthographic Dictionary
• Duden: Familiennamen - Origin and Meaning of over 20,000 Family Names
• Duden: Geographische Namen in Deutschland – German Toponymy
• Duden: Das Fremdwörterbuch – Dictionary of Foreign Loanwords
• Duden: Lexikon der Vornamen – Lexicon of Given Names
• Duden: Das Herkunftswörterbuch – German Etymological Dictionary
• Duden: Das Synonymwörterbuch – German Thesaurus
• Duden: Richtiges und gutes Deutsch – Practical guide to everyday questions of orthography, grammar, style and register.
• Duden: Das Wörterbuch medizinischer Fachausdrücke -  German Medical Dictionary
• Duden: Das große Buch der Zitate und Redewendungen – Dictionary of Quotes and Colloquial Expressions
• Duden: Das Wörterbuch der Abkürzungen – Dictionary of Abbreviations
• Duden: Das große Wörterbuch der deutschen Sprache in 10 Bänden – Dictionary focusing on the contemporary German language and the literary language of the 18^th and 19^th centuries.
• Duden: Deutsches Universalwörterbuch – Dictionary of Contemporary German
• Duden: Das Große Fremdwörterbuch – Comprehensive Dictionary of Foreign Loanwords
• Duden: Das neue Wörterbuch der Szenesprachen – Dictionary of Jargon
• Duden: Recht A–Z – Dictionary of Legal Terminology.
• Duden: Das Lexikon der Wirtschaft – Dictionary of terminology from business and economics.

Encyclopedias and Lexicons:

• Brockhaus in 15 Bänden - German Encyclopedia.
• Brockhaus Literatur:  The authors, works, eras and technical terms of literature.
• Alltagsbrockhaus: Das Lexikon der Alltagsfragen – Practical guide and possible starting point for exploring everyday problems in contemporary Germany.

Older German Typeface and Script:

• BYU German Script Tutorial – Resource for leaning older German script (Fraktur) and handwriting.
• Genwiki – Resource for learning older German script (Fraktur) and handwriting.
• Sütterlinschrift Inhaltsverzeichnis – Resource for leaning older German handwriting.

Miscellaneous:

• Zelder Universal-Lexikon – Digitalized version of the first major German encyclopedia, from the early 18th century.
• Harenberg: Kulturführer Oper – Guide to over 500 operas.
• Harenberg: Kulturführer Schauspiel – Guide to the world of theater.