SpaceFM is described as 'multi-panel tabbed file and desktop manager for Linux with built-in VFS, udev- or HAL-based device manager, customisable menu system, and bash integration. SpaceFM aims to provide a stable, capable file manager with significant customisation capabilities' and is a File Manager in the File Management category. There are more than 25 alternatives to SpaceFM for a variety of platforms, including Linux, Windows, Mac, BSD and Xfce. The best alternative is Double Commander, which is both free and Open Source. Other great apps like SpaceFM are Dolphin File Manager (Free, Open Source), Midnight Commander (Free, Open Source), File Explorer (Free) and Files (Free, Open Source).
Dolphin is a file manager for KDE focusing on usability. Has three view modes: Icon, Detail and it used to have Column View like in Finder (it is not available in current version due to problems with maintaibility). Supports FTP, SCP and other protocols. Highly configurable.
File Explorer (Windows 10), previously known as Windows Explorer, is a file manager application that is included with releases of the Microsoft Windows operating system from Windows 95 onwards. It is sometimes referred to as the Windows shell, explorer.
Files is a file manager which leverages the latest features of the Windows platform including Fluent Design, seamless updates, and APIs which enable the performance and lifecycle behavior that users expect.
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.
Far Manager is a program for managing files and archives in Windows operating systems. Far Manager works in text mode and provides a simple and intuitive interface for performing most of the necessary actions:
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.