What are some alternatives?
When comparing DevExtreme and Bootstrap, you can also consider the following products
JQWidgets - Unique toolkit for HTML5 Web development
Foundation - The most advanced responsive front-end framework in the world
Semantic UI - A UI Component library implemented using a set of specifications designed around natural language
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