Filester is the best FREE file manager WordPress plugin.
Accessing WordPress directory files and folders requires either your hosting service’s cPanel file manager or a File Transfer Protocol (FTP) client. Those methods could be troublesome when you have to switch between many different WordPress websites.
That’s where Filester Pro comes in. It helps you manage every WordPress configuration file right on your admin dashboard. Whether you need to troubleshoot an error, run a CSS tweak, or simply move your files, smart context menu of Filester has you covered.