Selectize.js - the hybrid of a textbox and <select> box

Selectize is the hybrid of a textbox and <select> box. It's jQuery-based and it's useful for tagging, contact lists, country selectors, and so on.

Selectize.js - Features:

• Skinnable — Comes with LESS stylesheets and shims for Bootstrap 2 and Bootstrap 3 (+ precompiled CSS).
• Clean API & Code + Extensible — Interface & make addons like a boss with the plugin system. Fully documented on GitHub & inline.
• Smart Ranking / Multi-Property Searching & Sorting — Want to search an item's title and description? No problem. You can even override the scoring function used for sorting if you want to get crazy. Uses sifter.js.
• Caret Between Items — Order matters sometimes. Use the left and right arrow keys to move between items.
• Select & Delete multiple items at once — Hold down option on Mac or ctrl on Windows to select more than one item to delete.
• RTL + Díåcritîçs supported — Great for international environments.
• Item Creation — Allow users to create items on the fly (and it's async friendly; the control locks until you invoke a callback).
• Remote Data Loading — For when you have thousands of options and want them provided by the server as the user types.