Tree of Germanic Languages

New High German

New (or Modern) High German is the contemporary descendent of Middle High German. It is the official language of Austria, Germany, and Switzerland. There are multiple extant dialects of High German.
High German partakes of the so-called second sound shift.
Number of Speakers (2000): 110 million

New Low German (Plattdeutsch)

New (or Modern) Low German (Plattdeutsch) is the contemporary descendent of Middle Low German. It is spoken on the North German plain in Germany and the Netherlands. The name Low Saxon is preferred in the Netherlands. There are multiple extant dialects of Low German.
Although Low German is frequently referred to as 'a dialect of German', it has linguistic roots which reach back at least as far as High German.
Number of Speakers: 1.5 to 2.0 million

New Swedish

New Swedish is a contemporary Eastern North Germanic language, a descendent of Old Swedish. It is the official language of Sweden and is one of the official languages of Finland.
Number of Speakers (1988): 9 million

Norn

Norn was a mixed language of West Norse and Irish spoken in the Shetland Islands. It is extinct.
There is extant an entire ballad text in Norn, Hildina-kvadet.
It is described in an article: Hildina-kvaedet. Ein etteroeknad og ei tolking. by Eigil Lehmann. It is printed in: Fra Fjon til Fusa 1984. Arbok for Hordamuseet og for Nord- og Midhordland sogelag.
Hildina-kvadet was written down in 1774 by the Scot George Low. He got it from a farmer - Guttorm - at the Shetland island Foula. Low did not understand the language, so the song will have to be "translated" into - well, whatever. What Lehmann does, is to try to reconstruct the Norn version of the song.
Lehmann's preface contains a bibliography, translated here by Reidar Moberg:
"The song was printed as early as 1808 by James Headrick, in 1838 by the Norwegian P.A. Munch. Others, who have been working on this kvad, is the Dane Svend Grundtvig, the Norwegian Sophus Bugge, Jakob Jakobsen from the Faeroe Islands, the Norwegian Moltke Moe and the Dane Axel Olrik. These have mostly tried to bring the kvad back to old Norse. Such a reconstruct from Axel Olrik from 1898 could be found in a work on the kvad of the Dane Hakon Grüner-Nielsen in the honour book to Gustav Indrebo 1939. The most thorough work is done by the Norwegian Marius Haegstad in the book Hildina-kvadet from 1900."