Via beSpacific, Harvard Law School Library runs the Nuremberg Trials Project,
bq. The Harvard Law School Library has approximately one million pages of documents relating to the trial of military and political leaders of Nazi Germany before the International Military Tribunal (IMT) and to the twelve trials of other accused war criminals before the United States Nuremberg Military Tribunals (NMT). …
bq. In this project only the English language trial documents and trial transcripts will be presented, but the evidence file documents are usually in both English and German.
German documents are online at the Oberlandesgericht Nürnberg.