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Vue.js - Reactive Components for Modern Web Interfaces
Selectize.js - Selectize is a custom <select> UI control with autocomplete and native-feeling keyboard...
Webix UI - An enterprise JavaScript Library for cross-platform app development with HTML5 JavaScript widgets and easy integration with most popular JavaScript Frameworks.
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.