ForkLift

ForkLift – is an alternative file manager with FTP client functionality. ForkLift is worth paying attention to if you work a lot with various external media (two-window mode will help) or actively use FTP servers. In both of these cases, the deciding factor is dual-window mode. It allows you to simultaneously see two different folders in one ForkLift window.
ForkLift is a simple and at the same time functional file manager for Mac OS.

This is a perfect app. I recommend using it!