Artsy - A global platform for discovering and collecting art.
Double 2 - Giving you a physical presence when you can’t be there
ArtMajeur - +1 Million original artworks, Free Shipping Worldwide, Low prices guaranteed, 14 days return: buy all the art you love on Artmajeur!
Perch - A bird’s eye view of social activity for you AND your competition.
WikiArt - The Encyclopedia of Fine Art
Nudee - Create a 3D printed "nude selfie" (slightly NSFW)