Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.
Preprocessors
Bootstrap ships with vanilla CSS, but its source code utilizes the two most popular CSS preprocessors, Less and Sass. Quickly get started with precompiled CSS or build on the source.
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.
For more information : bootstrap
Responsive design gets a whole lot faster
A Framework for any device, medium, and accessibility. Foundation is a family of responsive front-end frameworks that make it easy to design beautiful responsive websites, apps and emails that look amazing on any device. Foundation is semantic, readable, flexible, and completely customizable. We’re constantly adding new resources and code snippets, including these handy HTML templates to help get you started!
Build products, apps and services
Everything is semantic. You can have the cleanest markup without sacrificing the utility and speed of Foundation
You can build for small devices first. Then, as devices get larger and larger, layer in more complexity for a complete responsive design.
You can customize your build to include or remove certain elements, as well as define the size of columns, colors, font size and more.
Millions of designers and developers depend on Foundation. We have business support, training and consulting to help grow your product or service.
To more information : Foundation
