The British magazine Who Do You Think You Are has an article on the best websites for finding Holocaust records: Arolsen Archives, Yad Vashem, Every Name Counts, Wiener Holocaust Library, United States Holocaust Memorial Museum, JewishGen

https://www.whodoyouthinkyouaremagazine.com/tutorials/overseas/holocaust-records/

Jan Meisels Allen

Chairperson, IAJGS Public Records Access Monitoring Committee