I have quite a few apps spread over 4 Android devices, 3 phones and a tablet. I have several apps that have impressed everyone who has seen them, but I have one that every person I showed it to immediately downloaded it. It's called Word Lens. I showed it to one of my customers last week and he happened to have had the included documentation, what little was there, for 4 new Galaxy S5s on his desk. He was blown away. This app could translate every word in that little piece of paper on the fly using the camera, in real time. It currently supports 6 languages in both directions.