Select2 is described as 'JQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results. Look and feel of Select2 is based on the excellent Chosen library' and is an app in the development category. There are seven alternatives to Select2 for a variety of platforms, including Web-based, jQuery, JavaScript, Self-Hosted and Mac apps. The best Select2 alternative is Selectize.js, which is both free and Open Source. Other great apps like Select2 are Chosen, Tom Select, Bootstrap Multiselect and Selectr.
Selectize is a custom <select> UI control with autocomplete and native-feeling keyboard navigation. It's useful for tagging, contact lists, country selectors, and so on.
Selectize.js is the most popular Web-based alternative to Select2.
Selectize.js is the most popular Open Source & free alternative to Select2.
Chosen is a JavaScript plugin that makes long, unwieldy select boxes much more user-friendly. It is currently available as both jQuery Prototype plug-ins and with forks for supporting MooTools and Drupal.
Tom Select is the hybrid of a textbox and select box. It has autocomplete and native-feeling keyboard navigation. Useful for tagging, contact lists, etc.
Bootstrap Multiselect is a JQuery based plugin to provide an intuitive user interface for using select inputs with the multiple attribute present. Instead of a select a bootstrap button will be shown as dropdown menu containing the single options as checkboxes.
Tokeninput is a jQuery plugin which allows your users to select multiple items from a predefined list, using autocompletion as they type to find each item. You may have seen a similar type of text entry when filling in the recipients field sending messages on facebook.
jQuery TokenInput is the most popular Windows & Mac alternative to Select2.
Slim Select 2.0 is the most popular Self-Hosted alternative to Select2.
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It does not depend on JQuery