Ghost Commander

File manager for Android: Ghost Commander (FOSS)

Ghost Commander is a dual-panel file manager (as well as a client for FTP, SFTP, SMB, WebDAV, Drive, BOX, and Dropbox!) which will let you to manage your files locally (on the same device) or remotely (on a different device, like laptop or cloud).

I use Ghost Commander every day.

Download from Google Play:

Download from F-Droid: