Selectivity.js is a modular and lightweight selection library for jQuery and Zepto.js.
Zelect is a jQuery plugin to create custom
SumoSelect is a jQuery single/multi select plugin which can be used on almost any device. It can be fully customizable using simple css properties.
Select3 is a modular and lightweight selection library for jQuery and Zepto.js
pqSelect is a jQuery select plugin which converts ordinary multiple and single select lists into theme ready jQueryUI widget with support for grouping, disabled options, checkboxes for multiple select lists, radio buttons for single select lists, search box to search options, keyboard navigation and many options, methods and events.
Bootstrap Fullscreen Select is a custom fullscreen select / multiselect for Bootstrap using buttons or User defined elements, designed for mobile devices. This plugin makes it super easy for a user to use the 'select' on small touch screen devices.
EasySelect is a jQuery plugin to present multiple select elements in easier way.
Selectator is a jQuery-based replacement for select boxes. It supports searching, and affects the original select box directly, which is used as the data container.
A tutorial about building a script that is going to take an ordinary select element, and replace it with a better looking, markup powered version, while keeping all the functionality intact.
This is a nice animated custom select by using CSS3 and jQuery. CSS3 transitions and transforms are used to create this animated select.
Multi Column Select is a simple plugin that will hide the select control and then display a multicolumn dropdown (css). Uses the original form control so will work if JS is not enabled and the form can be processed as normal.
Flexselect is a jQuery plugin that turns regular select boxes into Quicksilver-like, flex-matching, incremental-finding controls.
Select or Die is a jQuery plugin to style/replace