Metro UI is an free, open source, html-first toolkit for developing web sites with HTML, CSS, and JS. With Metro UI, you can easily and quickly make a site from prototype to production. Metro UI includes general styles, responsive grid, layouts, typography, 100+ components and javascript routines, 800+ built-in icons.
![Metro UI Components Library](https://cdn-ak-scissors.b.st-hatena.com/image/square/dc6118c9b4db71aa38ad1591948b4e412c4ff847/height=288;version=1;width=512/https%3A%2F%2Fmetroui.org.ua%2Fimages%2Fm4-logo-social.png)