Drop Down
With HIOX FREE Drop Down Menu Builder/Creator tool you can create countless dynamic dhtml/javascript drop down menus with in few minutes, that too for free.
More Info 
Developer: HIOX
License: Freeware
Operating System: UNIX, Win NT, XP, etc.
Jddm (java Drop Down Menu) - Web Menu is a multi-platform compatible.
Developer: Tecnick
License: Freeware
Operating System: Unix/Linux/Windows
Apycom Drop Down Menu is a multi-platform compatible extremely powerful drop-down menu solution for your web site navigation.
Developer: www.apycom.com
License: Freeware
Operating System: Unix/Linux/Windows
Drop Down Menu Maker is a multi-platform compatible script that allows you to make a menu with three easy steps.
Developer: Codespy.com
License: Freeware
Operating System: Unix/Linux/Windows
DD Drop Down Panel lets you tuck away ordinary HTML content on the page and slides down on demand when the user clicks on the protruding tab.
Developer: Dynamic Drive
License: Freeware
Operating System: Not Available
This is a versatile drop down menu that can be applied to ordinary links on your page, including image links.
Developer: Dynamic Drive
License: Freeware
Operating System: All
HTML code of this Drop-Down Menu is very simple and without tables.
Developer: Konstantin Yagello
License: Freeware
Operating System: All
Mega Menus refer to drop down menus that contain multiple columns of links.
Developer: JavaScript Kit
License: Freeware
Operating System: Not Available
This flexible menu script lets you add a multi level drop down menu to any link on the page.
Developer: Dynamic Drive
License: GNU General Public License (GPL)
Operating System: Not Available
ross Browser Drop Down Menu is a multi-platform compatible COOLjsMenu PRO is professional version of the COOLjsMenu java script.
Developer: javascript.cooldev.com
License: Freeware
Operating System: Unix/Linux/Windows
Drop down messages is multi-platform compatible.
Developer: JavaScript Kit
License: Freeware
Operating System: Unix/Linux/Windows
Autoselecting Drop Down Box is multi-platform compatible script that fills the selection automatically on typing the first few characters of any value in the dropdown.
Developer: bmchebbi.addr.com
License: Freeware
Operating System: Unix/Linux/Windows
COOLjsMenu - Free Cross Browser Drop-Down Menu is a multi-platform compatible advanced cross-browser JavaScript menu that provides with some unique and not to be found elsewhere features.
Developer: javascript.cooldev.com
License: Freeware
Operating System: All
1-click Easy Drop-down Menues is both a Unix and Linux compatible simple script that creates a drop-down menu that opens pages on a single click when selected from the menu.
Developer: CodeLifter
License: Freeware
Operating System: Unix/Linux
With this program you can add a DHTML drop down menu to your web site within a few minutes.
Developer: xtreeme.com
License: Freeware
Operating System: All
Chrome Menu is a stylish CSS and JavaScript hybrid drop down menu.
Developer: Dynamic Drive
License: Freeware
Operating System: All
This is a lean CSS tab menu that supports a 2nd level drop down menu for any of its tabs.
Developer: Dynamic Drive
License: Freeware
Operating System: All
This is a sleek drop down menu that can be associated with any "anchor" link on the page.
Developer: JavaScript Kit
License: Freeware
Operating System: Not Available
A jQuery ticker script that can be viewed both sequentially and simultaneously, via drop down menu.
Developer: Dynamic Drive
License: Freeware
Operating System: Not Available
DD Mega Menu is the ideal menu script to use when you need a drop down menu system that supports arbitrary sub menu layouts, such as multiple columns of links or even arbitrary HTML.
Developer: Dynamic Drive
License: Freeware
Operating System: Not Available