Dynatree is a JavaScript dynamic tree view control with support for lazy loading of branches. Dynatree is a jQuery plugin that allows to dynamically create html tree view controls using JavaScript.

Features

• Open source
• Object oriented interface
• Support for Ajax and lazy loading of branches
• Hierachical selection and checkboxes
• Keyboard aware

This tree menu is distributed under MIT License.

Website: http://wwwendt.de/tech/dynatree/

View Demo: http://wwwendt.de/tech/dynatree/doc/samples.html

Mif Tree is a Free MooTools Tree control to create beautiful customizable Tree menus.  This control allows you to customize every part according to your needs.

The tree menu created with Mif Tree can also be browsed via keyboard and supports checkboxed tree menus.

Website: http://mifjs.net/tree/

Demo: http://mifjs.net/tree/Demos/index.html