This website is operated by the Central Registry of Information on Looted Cultural Property 1933-1945, a nongovernmental organization based in London. It contains an object and information database on stolen art that can be used free of charge. In addition to a press room, it provides information on relevant events and national policies.
http://www.lootedart.com/

This website is run by the National Fund of the Republic of Austria for the Victims of National Socialism. It provides information on art and cultural artifacts that, according to the latest provenance research, may have been seized under the Nazi regime and that are currently located in the museums and collections of Austria and the city of Vienna.
http://www.kunstrestitution.at/

A catalogue of 100 objects that were stolen by the National Socialists and are still in the custody of the German Finance Ministry.
http://www.badv.bund.de/003_menue_links/e0_ov/d0_provenienz/b0_dokumentationen/index.php

This website contains a catalogue of 1,300 objects stolen by the National Socialists. After the war, the Jewish Restitution Successor Organization and the Jewish Cultural Reconstruction gave them to the Israel Museum Jerusalem to hold in trust.
http://www.imj.org.il/Imagine/irso/index.asp

This website is a joint project by the German federal government and states. It contains a registry of cultural artifacts that were confiscated or displaced as a result of the Second World War and persecution under the Nazi dictatorship. Use of the site is free.
http://www.lostart.de/

This website is run by the French Commission for the Compensation of Victims of Looting Resulting from the Anti-Semitic Legislation under the Occupation. It provides practical information on filing compensation and restitution applications and includes a section containing the publications of the French Historians' Commission.
http://www.civs.gouv.fr/

The Art Loss Register is the largest private database in the world dedicated to lost and stolen art, antiquities and collectors' pieces. It is not limited to art looted by the National Socialists. Entries in the Artloss database are subject to a fee.
http://www.artloss.com/

The website of the Dutch Historians' Commission contains a database in which the holdings of the Nederlands Kunstbezit-Sammlung can be viewed free of charge. The collection consists of objects that the National Socialists looted in Holland. It was given to the state to hold in trust after the rightful owners were not located.
http://www.herkomstgezocht.nl/

This French government website provides general information on the objects in the collection of the Musées Nationaux Récupération (MNR) and includes a catalogue in which the works can be viewed free of charge. The objects are under the custodianship of French museums.
http://www.culture.gouv.fr/documentation/mnr/pres.htm

This website is run by the Cultural Property Research Foundation, Inc., an independent organization. It publishes the results of looted art research by a variety of scholars.
http://docproj.loyola.edu/index.html

The website of the American Association of Museums contains a catalogue of objects in American museums that changed hands on the European continent between 1933 and 1945 and may have been seized illegally by the National Socialists.
http://www.nepip.org/