Packaging Egg Box - No, it isn't software exactly. But it is a great example of a design that works well at revealing the beauty and nature of the content to the user rather than hiding it, which is what UX design ought to do more.
Pin Rain Shield, A Clever Redesign of the Umbrella. On the hierarchy of design, I believe that this fulfills all of the layers including creativity. The shield not only acts as a conventional umbrella, but also a shield from wind and sideways rain.