fman is described as 'The most modern dual-pane file manager. For Windows, Mac and Linux' and is a very popular File Manager in the file management category. There are more than 100 alternatives to fman for a variety of platforms, including Windows, Mac, Linux, BSD and PortableApps.com apps. The best fman alternative is Double Commander, which is both free and Open Source. Other great apps like fman are Files, Total Commander, Spacedrive and Dolphin File Manager.
Thunar is a 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, intuitive, and customizable. Thunar is fast and responsive with a good start up time and directory load time.
Terminal-based file manager offering a modern, customizable interface with split-screen panels, full keyboard shortcut support, fast file operations, offline access, privacy features, no ads, plugin extensibility, night mode, cross-platform compatibility, and open source code.
Sigma File Manager is a free, open-source, quickly evolving, modern file manager (explorer / finder) app for Windows and Linux.
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.
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:
MiXplorer (Mix of Explorers) is a fast, smooth, beautiful, reliable and fully-featured file manager with a simple and intuitive user interface.
Multi Commander is a multi-tabbed file manager and is an alternative to the standard Windows Explorer. It uses the very popular and efficient dual-panel layout.
The most advanced dual pane file manager and file transfer client for macOS.
Krusader is an advanced twin panel (commander style) file manager for KDE Plasma and other desktops in the *nix world.
xplorer² is a desktop file manager combining the simplicity of Windows explorer with the speed and efficiency of traditional dual pane file managers.
muCommander is a lightweight, cross-platform file manager with a dual-pane interface. It runs on any operating system with Java support (Mac OS X, Windows, Linux, *BSD, Solaris...).
File Pilot is a file explorer built from scratch for light-speed performance, with a modern and robust interface.
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It is still developed and its developer is very responsive.