XtraFinder!

QTTabBar is an extension for Windows Explorer that brings tabbed browsing to Microsoft's file browser. It comes with a number of nifty features including a favorites function for launching folders and applications, groupings of folders that can be opened together, tooltip preview functions for a number of file types, and others. It is also highly customizable and hotkey-enabled.

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.

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

"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." »

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:

TidyTabs is a tool that brings tabbed browsing to all your programs. Ever wanted to have Chrome-style tabs in Windows Explorer, Microsoft Office or PuTTY? TidyTabs does just that. It integrates nicely with the OS and you will feel like the multi-tab functionality is a core part of Windows.

Nimble Commander for Mac OS X

File Buddy is best thought of as a collection of tools for managing the vast number of files and folders found on your hard drive. A complete list of what File Buddy can do is too extensive to list in its entirety, but the following lists many of the things you can do with it quickly and easily.

We tabbified your current Windows File Explorer by wrapping BrightExplorer around it, and added other advanced functionality for example a brand new favourite panel!

Disk Order is a dual pane file manager for your Mac.

Saladin is an open source dual-pane file manager for Windows which merges the capabilities of File Explorer with the well known and easy to use orthodox user interface. Saladin supports both 32-bit and 64-bit versions of Windows Vista, Windows 7 and Windows Server 2008.

Add tabs to Windows explorer. Make Windows Explorer like a tabbed browser.

An efficient dual-pane file manager that enables you to browse your drive's content in an organized environment via intuitive actions.

Windows Double Explorer manages two or more Windows Explorer in one application. Also you can add your favorite folders with drag and drop to the toolbar for quick access. It's easyier to manage your disc structure. (A kind of Norton Commander or Total Commander)