WikiArt - The Encyclopedia of Fine Art
Responsive Viewer - View multiple screen dimensions in one view
ArtMajeur - +1 Million original artworks, Free Shipping Worldwide, Low prices guaranteed, 14 days return: buy all the art you love on Artmajeur!
Responsinator - Designed to test responsive websites on different devices.
Saatchi Art - Online art platform for buying, selling and discovering art.
Responsive Website Test - Test any website on desktop, mobile, and tablet