Webmasters-central.com :: Submit Your Internet Marketing Resource. Webmaster Resources, Articles, Tutorials and Tips on Online Marketing.

Expanding Menus is a program to easily generate suites of related pages containing expanding and collapsing heirarchical menus.
Price: Freeware

FastMenu quickly and easily adds popup menus to any web page. Our incredibly convenient "point and shoot" interface lets you pick any location in your web page to install your menus. Choose menu colors, border thickness, font face and size, and more. The resulting menus work correctly in all common browsers, with great backwards compatibility features for older programs.
Price: $10.00

Make page and site navigation simple and intuitive for your users. Choose between CGI or JavaScript development methods. The list appears as a drop-down menu from which you can select one item. On clicking the 'Go' button you are automatically taken to the appropriate URL.
Price: Freeware

This is a script I wrote to aid me in my web design. When I changed my pages to use a form of navigation similar to the Windows Explorer, I had to create several little HTML files that all pointed to each other to make the menu fully functional. Unfortunately, if I added something to it, I had to edit every file that contained that section... and if I added a whole new category, I had to edit all of the files... and doubled the number of them in the process. The solution was to create a script that does all of that for me.
Price: Freeware

Now you can have all of your links in one place, that always are displayed on your web site. If you hate editing your links on your pages, or never can find the right place to put them, then you'll love Quick Links. You can even make more money with your affiliate programs by making your links stand out more!
Price: $199.95/Free for Members

This is a script that, when called, reads the data from a determined file and sets up a site index based on that information. Creates updates that are far easier to maintain.
Price: Freeware

This is a script designed for navigating a web site via a pull-down menu on the page. I've only tested it on a unix server, but it's simple enough that I don't see why it won't work on any server that has perl installed. All you need to do is put it in a working cgi-bin, set it executable, make sure the path to perl is correct, set your base URL, and you're set. Since it doesn't call any local files, it should work on any web server.
Price: Freeware