Selectize is the hybrid of a textbox and select box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
Selectize is an extensible jQuery-based custom <select> UI control. It's useful for tagging, contact lists, country selectors, and so on. It clocks in at around ~7kb (gzipped). The goal is to provide a solid & usable experience with a clean and powerful API.
Smart Option Searching / Ranking
Options are efficiently scored and sorted on-the-fly (using sifter). Want to search an item's title and description? No problem.
Caret between items
Order matters sometimes. Use the ← and → arrow keys to move between selected items.
Select & delete multiple items at once
Hold down option on Mac or ctrl on Windows to select more than one item to delete.
Great for international environments.
Allow users to create items on the fly (async saving is supported; the control locks until the callback is fired).
Remote data loading
For when you have thousands of options and want them provided by the server as the user types.
Clean API & code
Interface with it and make modifications easily. Pull requests welcome!
Plugin API for developing custom features (uses microplugin).
Plays nice with iOS 5+ devices.