The only museum in the U.S. that's dedicated both to historic and contemporary design, the Cooper-Hewitt has everything from 18th century scraps of fabric to modular toys. And now they have their first iPad app. After acquiring the code, the museum made it open source. "The Cooper-Hewitt will own it—but so will everyone. As a result, Planetary will become an infinitely evolving piece of design." Learn more and download it here.