Dropdown
Download Select Box Factory (1.0)
by The UI Guy | http://theuiguy.blogspot.com/2008/09/ultimate-dropdowns-v10.html
Enhanced select box
Download Elegant Menu (1.2)
by ChromaSynthetic | http://www.chromasynthetic.com/blog/elegant-menu-mootools-plugin/
Features include automagic calculation of widths so you no longer need to define them in the css if you don’t want to. Additionally, you can attach your own events when the menus are shown and hidden, and it’s easier to change the speed of the animation.
Download MultiSelect (1.1)
by Justin Maier | http://dev.justinmaier.com/multiSelect
multiselect.js, a mootools plugin, is the multiple select drop down that should exist in standard html (but doesn't!).
Download AutoCompleter (1.1)
by Harald Kirschner | http://digitarald.de/project/autocompleter/
This AutoCompleter script for MooTools provides the functionality for text suggestion and completion. It features different data-sources (local, JSON or XML), a variety of user interactions, custom formatting, multiple selection, animations and much more.
Download FaceBookList (0.2)
by Guillermo Rauch | http://devthought.com/textboxlist-meets-autocompletion/
If you used Facebook on a regularly basis, you’ve probably come across their cool autocomplete method of adding multiple recipients to messages.
Download n2Select (1.5.1)
by nn2luv | http://nn2luv.com/sugar/n2select/
n2Select is a select object replacement class that creates stylish selects via CSS