Art UK: Showcase for art in over 3,200 public, collaborating UK collections (museums, universities, town halls, hospitals, civic buildings), where 80% of the art is not on public view.
British Library: Images Online: The Picture Library of the British Library holds over 150 million items including the King's Library, manuscripts, rare books, musical texts, maps, illustrations, drawings, paintings and photographs spanning almost 3000 years
British Library: Online Gallery: 30,000 items from the British Library Collection, including Online Exhibitions
British Museum Collection: High-definition images, enlargeable for detailed examination, 4.5 million early to contemporary objects
Digital Imaging Project: Art historical images of sculpture and architecture from pre-historic to post-modern (Prof. Mary Ann Sullivan, Bluffton University).
Folger Shakespeare Library: Digital Image Collection: High resolution images from books, theater memorabilia, manuscripts, and art to re-use provided credit is given. Direct link to database catalog
Google Art Project: Google's collaboration with over 250 art institutions to enable the discovery and viewing of tens of thousands of artworks from more than 6,000 artists in high resolution images online
Google Arts & Culture: Platform to access high-resolution images of artworks housed in the initiative's partner museums.
Louvre Collections: More than 480,000 works in the Musée du Louvre and Musée National Eugène-Delacroix. Updated on a daily basis
Mapping Gothic France: Project of Dr. Stephen Murray, Art History and Archaeology, Columbia University and Dr. Andrew Tallon, Art, Vassar College, funded by Andrew W. Mellon Foundation. A 3-D database of images, texts, charts and historical maps, to explore Gothic architecture and the formation of France in the 12th and 13th centuries.
Rijksstudio: Over 709,000 digitized artworks,searchable by artist, object type, period, and place. Most works are in the public domain - downloadable and even customizable with the museum's free resources.
V&A Collections: 1,146,388 objects and 416,583 images from the V&A's collections
Visual Collections - images of art, history and culture: More than 300,000 images in cartography, fine arts, architecture and photography from over fifty renowned collections
Web Gallery of Art: Digital reproductions of European paintings and sculptures created between the years 1100 and 1850