So weird for me to see this popup now on HN as I happened to dig through an old downloads folder a few minutes ago and saw an install file for Pepakura (13/11/2014), and wondered where that sort of thing had ended up... .

But for Mac! I fonder the difference of the free and paid version through.

No!

This one is called Unfolder, it's a different app, made by a different person, etc...

More than one app per category can exist, and that's good!