Java Drop Down Menu (JDDM) - Version 2.0 JDDM is a drop down menu java applet, a comprehensive solution for website navigation. JDDM is browser-independent and highly-configurable, it could be easily customized to fit your website needs and to achieve an unlimited variety of menu appearances and behaviors. JDDM let you generate vertical and horizontal menus with unlimited number of nested pop-up submenus, various color schemes, buttons, fonts, icons and sounds.