WinDirStat for smart phones! It's a great way to help make sure I'm not wasting space  especially when video podcasts and other media can fill it up quickly. Only problem is unlike WinDirStat  the only external apps the GUI can pass data to is a specific file manager you have to buy to use (so the app is kind of an ad for the file manager.) Beyond that  it's great.
March 06 2015