JDDM (Drop Down menu) is a drop-down menu Java applet, a comprehensive solution for Web site navigation. It is browser-independent and highly-configurable, and could be easily customized to fit your Web site needs to achieve an unlimited variety of menu appearances and behaviors. It lets you generate vertical and horizontal menus with an unlimited number of nested pop-up submenus, various color schemes, buttons, fonts, icons, and sounds.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.