Google Arts & Culture - Explore collections of art and culture from around the world, both past and present.
Google Art Palette - Unique color combinations, drawn from the world of art
Altamira - Altamira is a communal marketplace for art, artists, and their fans...
Magnus - Shazam for art
Google Cultural Institute - Explore art, landmarks and exhibitions from around the world
Artsy - A global platform for discovering and collecting art.