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)   dhtmlxTree - JavaScript Tree Menu 1.2
Cross-browser JavaScript Tree Menu with XML support, dynamical loading and rich API. The tree has built-in checkboxes, context menu, drag-&-drop and customizable items. There are CF and JSP tags for dhtmlxTree, as well as ASP.NET custom control.

 3)   CodeThatTree JavaScript Tree 2.2.9
CodeThatTree is an advanced cross-browser state-of-art JavaScript tree control that can be easily integrated in any web page, requires no JavaScript knowledge from the prospective user and is provided with the wide range of the features.