File Manager by Astro (File Browser)

One of the problems with Android devices is that they don’t usually ship with an integrated file manager. It’s true that, for the most part, users don’t need to have access to the file systems, but there are exceptions. Some people like to have complete control over their OS, and a file manager is the first step to achieving that.
The ASTRO File Manager allows users to access the contents on the phone, the SD card, the internal memory, cloud storage devices such as Dropbox, Google Drive, Facebook, Box, Microsoft OneDrive, and much more.
Also, the app comes with a download manager, the ability to compress files and extract archives, and a powerful task killer to free up the memory.