Hopper is a Mac app for deconstructing binaries for analysis and debugging. If you're not a developer it's probably not for you, but it's a cool tool nonetheless, built from scratch by a developer who built it himself. Once again a developer needed something, didn't like what was out there, and built what he needed then used Apple's storefront to sell it in case others needed the same thing. In fact, in this case there were only some Windows tools, clumsily ported to Mac in some cases so Vincent built Hopper to his standards.
