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.
Design is a huge part of UX, acronym for User Experience. This is the very reason why a lot of designers think that a good UI or user interface makes up for a good user experience. This however, is not true.