4. Sliding Explorer
One of Android's greatest assets for power users is its unrestricted file system access: You can browse your Android device just like a computer, navigating through folders and moving, deleting, or sharing files as you wish.
There are plenty of apps to help you do that, but Sliding Explorer stands out for its clean and modern user interface. Sliding Explorer makes it easy to manipulate folders and files, zip and unzip archives, and share files directly to any service you have on your device (email, cloud storage services, and so on). And best of all, it's free.