As of 04/20/2018 - 01:00, this link is reporting 302 - Found.
"Memorial" is a community of dozens of organizations in different regions of Russia, Ukraine, Kazakhstan, Latvia, and Georgia, for the "awakening and preservation of the societal memory of the severe political persecution in the recent past of the Soviet Union." The site is in Russian, English and German.
Centropa is the signature project of the Central Europe Center for Research and Documentation, a US-based non-profit corporation, headquartered in Vienna, Austria. They are an international team of historians, filmmakers, web designers, journalists, educators, photographers and Jewish community activists. The goal is to create a window into Jewish history, and current events, in Central and Eastern Europe and the former Soviet Union. In English, German and Hungarian.