The following databases helped me a great deal researching the fate of family members:
- Gedenkbuch für die Opfer der Verfolgung der Juden unter der nationalsozialistischen Gewaltherrschaft in Deutschland 1933-1945 (Bundesarchiv, memorial book for the victims of the Naziregime)
- Shoa Names Database (Yad Vashem)
- JewishGen.org
- Epigraphische Datenbank des Steinheim-Instituts (Jewish cemeteries)
- Gedenkbuch des Reichsbundes jüdischer Frontsoldaten (memorial book for fallen jewish soldiers of WWI)
- holocaust.cz (Theresienstadt)
- joodsmonument.nl (Netherlands)
- dutchjewry.org (Netherlands)
- hohenemsgenealogie.at (Austria)
- genteam.at (Austria)
- genealogy.org.il (Israel)
- archives.gov.il (Israel State Archive)
- hebrewsurnames.com (Argentina)
- familysearch.org (especially ship manifests)
- DigiBaeck (Archive of the Leo Baeck Institute)
- collections.ushmm.org/search (United States Holocaust Memorial)
- statistik-des-holocaust.de (documents about deportations)
- calzareth.com/aufbau/search.html (database of personal anncouncements in the German-Jewish newspaper Aufbau, New York)
- German „Minority Census“ 1939 (Tracing the past)
- WGA database (Historisches Archiv Berlin, database of compensation files)
- Name adoption list (List of Jewish family names adopted in the 19th century)
- lagis-hessen.de/de/subjects/index/sn/juf (Jewish cemeteries in Hessen)
- Compact Memory (Judaica, university library Frankfurt)
- DigiBib Adressbücher (German addressbooks, some digitized)
- Berlin address books (Berlin state library)
- Cologne civil registers (Town archive of Cologne)
- Hamburg address books (University of Hamburg)
- Hamburg Civil registers (Hamburg state archive)