No idea about QR codes - there is something called zbarcam that decodes qr codes from a video device. Is that what you mean?
It is true that a lot of android and iphone 'apps' are little more than a URL. It does turn out that those are popular though, and we probably should do more to make such things easy to come by on linux desktops. It seems tome that this is actually a problem of organisation - how do you find what you want in half-a-million bits of software?