Cabinet was one of the first apps to apply Google's new design directives, launching even before Android Lollipop became officially available. It's a basic file browser that makes it easy to jump between directories and access the files on your phone. Just this week I downloaded Lil Wayne's new mixtape directly to my phone and used Cabinet to unzip the file and place it in my Music folder. Cabinet is still listed as a beta, but I haven't found any reason to not rely on it full time. It's available for free from the Play Store now.