jQuery - The Write Less, Do More, JavaScript Library.
React - A JavaScript library for building user interfaces
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Vue.js - Reactive Components for Modern Web Interfaces
jQuery UI - Curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library
Select2 - Select2 offers customizable select box with support for searching, tagging, infinite scrolling, and many other used options.