Let's get a list of "Hidden Gems"

Those android apps that are just so awesome, and well designed. They follow the latest design guidelines and don't usually show up in the first page of search results.

Some examples I've found here and elsewhere:

Flow for Reddit
Muzei live wallpaper
Axis Icon set
Flixtor (Stream movie torrents)
Holo Compass

These are just some examples. I also use Nova Launcher and though most people here are familiar with it, most of my non-techie friends with android just putter along with the stock apps.

So, what are the creme de la creme, in your opinion.