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York Project
About Directmedia has provided 10,000 paintings from the 'York Project DVD "10.000 Meisterwerke der Malerei" (10,000 Masterpieces of Painting) and the associated metadata to... -
Wikimedia Commons
Over 2 million freely usable media files to which anyone can contribute -
Victoria & Albert Museum Collection Records
A REST API to search the V&A's collection. Sadly restricted to academic and noncommercial use. Search for items by keyword, artist/maker, collection, year,... -
VADS
"over 100,000 digital images free for use in education"