Path Finder!

Double Commander is a cross platform open source file manager with two panels side by side. It is inspired by Total Commander and features some new ideas.

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.

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. Thunar is fast and responsive with a good start up time and directory load time. Thunar is accessible using Assistive Technologies and is fully standards compliant.

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.

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

Advanced twin panel (commander style) file manager for KDE and other desktops in the *nix world, similar to Midnight or Total Commander. It provides all the file management features you could possibly want: extensive archive handling, mounted filesystem support, FTP, advanced search module, an internal viewer/editor, directory synchronisation, file content comparisons, powerful batch renaming and much much more.

XtraFinder add tabs and extra features to the Finder.

Brings features from Sublime Text to the file manager niche.

Nimble Commander for Mac OS X

Inspired by Jef Raskin, our zoomable user interface shows you all the stuff on your computer on a single surface. Using zoom and pan to view, arrange and open documents feels so right. In minutes you’ll appreciate the simplicity and intelligence of our answer to the traditional desktop. Take a spin and see for yourself.30-day trial available, $24.99 to buy.

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.