Hard to compete with some of the great things accomplished by others here (spaceships, businesses, businesses that process logs from spaceships while cycling around the country in spaceships while making your mother laugh about a nuclear power plant you helped build that hopefully does not run Windows, etc.), BUT I'll try anyway and throw out my Dead By Zombie game (http://DeadByZombie.com), whose Windows port just launched last week. It has a Rogue-like UI style but is otherwise very different from a Rogue-like in terms of play style and goals. I tend to develop several new hobby projects each year from scratch, outside my day job in software development, and then release them and try to monetize them in various ways. By HN standards, probably pretty simple and unimpressive.

I think it's just good to be creative and productive. By my standards, it's impressive to be doing things like this rather than merely sitting around watching TV or making inane chit-chat at bars, like so many Americans seem to do. (Though there's value in doing even those in moderation.)

Live, love, think, create, do, repeat. A life full of that is what impresses me.