Plasso

Weird new name (was Spacebox), but such a beautiful web app. Great transitions, great sense of depth and feeling to it. A joy to click around in. Seems like it's an ecommerce interface built on Stripe that handles the actual front-end stuff for you. So if you don't want to set up Stripe, you can set this up instead to take payments (for an extra 3% on top of Stripe's fees).