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)   JWTM (Web Tree Menu) 1.1.003
JWTM is a professional java tree Web menu applet. JWTM lets you generate tree menus with unlimited number of nested pop-up submenus, various color schemes, buttons, fonts, icons and sounds.

 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.

 4)   Tree Navigation System. 1.3
Organise your pages easily and logically and help guide your visitors around your web site with this Tree Navigation applet.