WHAT THE FLEXBOX?! - A simple, free 20 video course that will help you master CSS Flexbox

http://flexbox.io/

Material Design Lite lets you add a Material Design look and feel to your websites. It doesn’t rely on any JavaScript frameworks..

https://getmdl.io/

Glyphter

The SVG Font Machine – Drag and drop an SVG in a grid and export the webfont kit..