Disk Order!

GNU Midnight Commander is a visual file manager, licensed under GNU General Public License and therefore qualifies as Free Software. Its a feature rich full-screen text mode application that allows you to copy, move and delete files and whole directory trees, search for files and run commands in the subshell. Internal viewer and editor are included.

One Commander (previously bitCommander) is a Windows file manager (Windows 7, 8 and 10) with improved Miller Columns (OSX Finder's column view) and two-panel support. It simplifies file management with intelligent file representation, relative file dates (shown as days since creation), ToDo notes in any folder, batch file processing without interrupting for copying errors, and much more.Windows Store version: https://www.microsoft.com/store/apps/9NBLGGH4S79B

muCommander is a cross-platform file manager that will run on any operating system which supports Java. It features a Norton Commander style interface to allow easy manipulation of files with many keyboard shortcuts. Pre-compiled builds are available for Mac OS X, Windows, Linux, Solaris, *BSD, etc.

"Dual pane file manager and SFTP/FTP client for Mac OS XForkLift is designed to be the fastest, most powerful file manager for the Mac. Connect to FTP or SFTP servers, manage your Amazon S3 account or your mobile devices over Bluetooth. All these features are beautifully integrated into a sophisticated, yet easy to use Cocoa based interface. Dual-pane view will dramatically increase your productivity along with state-of-the-art features like live preview, spring loaded folders and any-to-any workflow. All this to be topped by tabs, to keep your workspace nice and clean." »

Commander One is dual-pane file manager for OS X created in Swift, which enables you to manage your files in the best possible way.

XtraFinder add tabs and extra features to the Finder.

TotalFinder brings tabs to your native Finder and more! Other features include dual-panel mode and showing folders before files.

Path Finder is a standalone Finder replacement that takes the Finder's familiar interface and adds numerous powerful features and interface innovations to help anyone be more productive on Mac OS X. It features:

Brings features from Sublime Text to the file manager niche.

A small and two-pane file manager with open plugin architecture. Has the ability to view content of files (text, html, over 40 picture formats, mp3), support for archives (zip, rar, arj, cab, tar/gzip, etc.), and (S)FTP support.

Nimble Commander for Mac OS X

Vifm is a ncurses based file manager with vi like keybindings. If you use vi, vifm gives you complete keyboard control over your files without having to learn a new set of commands.