Vue.js - Reactive Components for Modern Web Interfaces
Materialize CSS - A modern responsive front-end framework based on Material Design
Webix UI - An enterprise JavaScript Library for cross-platform app development with HTML5 JavaScript widgets and easy integration with most popular JavaScript Frameworks.
Foundation - The most advanced responsive front-end framework in the world
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions