Marta is described as 'dual-pane file manager. Most of the time you work with two directory panes placed side-by-side' and is an app in the File Management category. There are six alternatives to Marta for Mac, Windows, Windows Mobile, Android and Android Tablet. The best alternative is Total Commander, which is free. Other great apps like Marta are Forklift (Paid), Finder (Free), Commander One (Freemium) and Path Finder (Paid).
Total Commander is a shareware Orthodox File Manager (OFM) for Windows. Some features include a built-in FTP client, file compare, archive file navigation, and a multi-rename tool with regular expression support.
The Finder is the first thing that you see when your Mac finishes starting up. It opens automatically and stays open as you use other apps. It includes the Finder menu bar at the top of the screen and the desktop below that.