The ARTstor Digital Library provides more than one million images with tools for teaching and research. Its collections comprise contributions from outstanding museums, photographers, libraries, scholars, photo archives, and artists and artists' estates from all over the world. An overview of collections is available under http://www.artstor.org/collections.
Catalogue of Exhibited Works and Depository Holdings. The online edition Paintings in Museums presents a systematic index of the entire holdings of works, both on display and in deposits, owned by nearly 650 museums in Germany, Austria and Switzerland. A comprehensive and current catalogue for over 178,000 paintings, pastels, gouaches as well as mixed-media works from all ages, genres and styles of about 31,200 artists is therefore available to the user.
prometheus is a digital image archive for Art and Cultural Sciences containing approx. 360.000 images -- prometheus ist ein digitales Bildarchiv für Kunst- und Kulturwissenschaften mit ca. 360.000 Bildern