Sproget: multi-dictionary with meanings in danish:
Den Danske Ordbog, Retskrivningsordbogen
Retskrivningsordbogen: spelling
of Danish words
Ordbog over det danske sprog (1700-1950) meanings
in Danish
Nye ord i dansk: Danish dictionary
of new terms (from 1955 to today)
Danish-English dictionary (multilingual) Swedish,
German, French, italian, Spanish, Portuguese
Danish-English dictionary basic, with phonetic
online translation: Danish-English & other languages & web
page
useful
expressions Danish-English with sound (Loecsen)
useful expressions Danish-English
with sound
Dansk ordbog:
Danish dictionary by Christian Molbech (1833) < >
A-N & M-Z
Dictionary
of the English and Danish Languages, adapted to the use of schools and learners of both languages, by Cecil
Hornbeck (1863)
Danish >
English
Engelsk-Dansk Ordbog:
Danish-English dictionary by Svend Rosing (1887)
Dansk-Engelske
Ordbog: Danish-English dictionary by William Mariboe (1861)
Dictionnaire
français-danois: French-Danish dictionary by Lauritz Stephan Borring (1841)
Ordbog til det ældre danske sprog
(1300-1700) by Otto Kalkar (1907) 
Danish keyboard to type the special characters of the Danish
alphabet
Danish grammar & pronunciation
verb conjugation & Danish-English
translation
Danish Grammar
by Rasmus Rask (1846)
Simplified grammar
of the Danish language by Elise Otté (1883) & Swedish
Practical and easy
method of learning the Danish and Norwegian languages by H. Lund (1900)
Danish and Dano-Norwegian
grammar by Peter Groth (1894) 
Guide to the Danish
language for English students, by Maria Bojesen (1863) with phrases translated in English
books about Danish language: Google
books & Internet
archive
Royal Library of Denmark
Danish literature: online books, by authors
- titles - periods
old books:
15th-16th century
the Bible in Danish
bilingual Bible Danish-English & other languages
Alle mennesker er født frie og lige i værdighed og rettigheder.
De er udstyret med fornuft og samvittighed, og de bør handle mod hverandre i en broderskabets ånd.
First article in many languages
Declaration of Human Rights: bilingual text in Danish, English,
Norwegian, Swedish...
Denmark: maps, symbols, heritage & documents
Norwegian - Icelandic - Swedish
Germanic languages (in French)