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The Paris Opera is making shows available from its archives free of charge. The list of shows can be found on their website. Only available in France.
Paris Art Museum Paris Musées, a collection of 14 museums in Paris, have recently made high-res digital copies of over 100,000 artworks freely available to the public on their collections website. Artists with works in the archive include Rembrandt, Monet, Picasso, Cézanne, and thousands of others.