GNOME Commander is described as '"two-pane" graphical file manager for the GNOME desktop environment. GNOME Commander aims to fulfill the demands of more advanced users who like to focus on file management, their work through special applications and running smart commands' and is an app in the File Management category. There are more than 50 alternatives to GNOME Commander for a variety of platforms, including Windows, Linux, Mac, Xfce and BSD. The best alternative is Double Commander, which is both free and Open Source. Other great apps like GNOME Commander are Total Commander (Freemium), QTTabBar (Free), Midnight Commander (Free, Open Source) and Dolphin File Manager (Free, Open Source).
Thunar is a new modern file manager for the Xfce Desktop Environment. Thunar has been designed from the ground up to be fast and easy-to-use. Its user interface is clean and intuitive, and does not include any confusing or useless options.
ranger is a file manager with VI key bindings. It provides a minimalistic and nice curses interface with a view on the directory hierarchy. The secondary task of ranger is to psychically guess which program you want to use for opening particular files.
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.
Explorer++ is a free file manager for Windows. Available on Windows XP and above, it features the same familiar interface as Windows Explorer, while introducing several enhancements and improvements for a much richer file browsing experience.