ES File Explorer is an enormous multi-functional app for your managing your Android mobile resources, and it’s totally free. It is a file manager which allows you to create, delete, copy, and paste files, an application manger which allows you to install and uninstall apps, a download manger, and a task killer to prevent your device from lagging and crashing, all in one simple app. ES File Explorer also gives you the ability to share files like videos using 3G, 4G, and Wi-Fi with impressive speed, and it also has a cloud storage client that supports every other online cloud storage service you might use (like Dropbox) and supports ZIP and RAR files.