WikiArt - The Encyclopedia of Fine Art
ArtMajeur - +1 Million original artworks, Free Shipping Worldwide, Low prices guaranteed, 14 days return: buy all the art you love on Artmajeur!
Saatchi Art - Online art platform for buying, selling and discovering art.
Artboost - Artboost is an art marketplace.
ArtStack - ArtStack is the social platform for art - we believe the best way to discover art is through people.
Magnus - Shazam for art