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Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
HTML KickStart - HTML KickStart is a ultra–lean set of HTML5, CSS, and jQuery (javascript) files, layouts, and elements designed to give you a headstart and save you a lot of hours on your next web project.
Materialize CSS - A modern responsive front-end framework based on Material Design
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
Purecss - A set of small, responsive CSS modules that you can use in every web project.
UIKit - A lightweight and modular front-end framework for developing fast and powerful web interfaces