w3 Sitetree

w3 Sitetree is a web-based navigator based on a tree structure, which gives you an interactive sitemap directly on your web page. In comparison with similar Java solutions, w3 Sitetree is much faster and totally browser independent as well as OS independent. w3 Sitetree is virtually without limits; It has been tested with 400,000 branches and 4 million nodes without any loss of speed. You can use any data source you wish, by creating so called loaders you decide what to browse in the tree. All node icons, colors and typefaces can easily be customized to fit your website and design.