UIkit : UIkit A lightweight and modular front-end framework for developing fast and powerful web interfaces.
UIkit

Overview
UIkit A lightweight and modular front-end framework for developing fast and powerful web interfaces. UIkit gives you a comprehensive collection of HTML, CSS, and JS components which is simple to use, easy to customize and extendable. UIkit is open source and MIT licensed. It is absolutely free of charge and you can use, copy, merge, publish and distribute the framework without any limitations.

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Features

LESS

UIkit is developed in LESS to write well-structured, extendable code which is easy to maintain.

Components

A collection of small, responsive components using consistent and conflict-free naming conventions.

Customizer

UIkit's very basic style can be extended with themes and is easy to customize to create your own look.

Responsive

With the mobile-first approach UIkit provides a consistent experience from phones and tablets to desktops.