The very best site - in English and French. Dances of death from all of Europe with pictures and text. Lots of pictures of The triumph of Death, The Three Living and the Three Dead, Death and the Maiden etc. etc. Patrick Pollefeys has a separate page about Lübeck.
A Norwegian site with a chronology of the dance of Death. Includes the text from Copenhagen's Dance of Death from 1536 including the old woodcuts.
German page. Some pictures and reviews of the books and magazines published by the society. Includes a section about Lübeck.
German page with links to articles about dances of death.
The entire Bible (King James) annotated by a Skeptic. Impressive piece of work.
From the Classic Literature Library.
Cross referenced, searchable and authorized by her Majesty the Queen, Margrethe the 2nd.
An Atheist's view of the Bible. Danish Text!
Low German / Low Saxon is alive on the Net. Lowlands has a grammar of the language. There are Low German dictionaries and Radio Bremen even offers a course in modern Low German.
One of the best medieval Low German books, i.e. Reynke Vos, (Reynard the Fox) is available along with Dutch and High German versions.
Card nr. 13 is Death, but there are more similarities between tarot and dances of death (Danish text).
Thousands of old books have been digitized and can be downloaded in PDF format. Search Google Books for 'Dance of Death' or 'Totentanz' or 'Todtentanz'. The Internet Archive has fewer books, but on the other hand the scan-qualitiy is higher.
Dansk 
Lübeck's dance of death
Links