1)   Treeview - JavaScript Tree Menu 4.3
A compact, fast, reusable script that lets you enhance your site with an outliner that looks and feels exactly like Windows Explorer. Download the JavaScript/DHTML applet for free and configure it with the online visual builder.

 2)   dhtmlxToolbar 1.0
dhtmlxToolbar is a free JavaScript Toolbar with high functionality, XML support, cross-browser compatibility and rich API. Completely customizable - you can freely define visual appearance of this DHTML Toolbar by simply changing its parameters.

 3)   dhtmlxMenu 1.0
dhtmlxMenu is a customizable JavaScript menu with high functionality, XML support, cross-browser compatibility and rich API. You can freely define visual menu appearance and complexity by simply changing menu parameters. Free for non-commercial use.

 4)   CodeThatXPBar 1.2.1
CodeThatXPBar is a JavaScript navigation control that provides with the same look and feel and functionality as the special control bar which can be found in Windows Explorer.