What are some alternatives?
When comparing DevExtreme and w2ui, you can also consider the following products
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
JQWidgets - Unique toolkit for HTML5 Web development
Vue.js - Reactive Components for Modern Web Interfaces
Kendo UI - Fast, light, complete: 70+ jQuery-based UI widgets in one powerful toolset
UIKit - A lightweight and modular front-end framework for developing fast and powerful web interfaces