jQuery - The Write Less, Do More, JavaScript Library.
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Harp - The static web server with built-in preprocessing.
Vue.js - Reactive Components for Modern Web Interfaces
Umbrella JS - Tiny library for DOM manipulation, events and AJAX
React - A JavaScript library for building user interfaces