Susy

Susy is a Sass-based layout toolkit for developers. Susy is easily customisable and comes with awesome features to suit the needs of every project.

Susy is a lightweight grid-layout engine for Sass, designed to simplify and clarify responsive grid layouts without ever getting in your way. You can use Susy with floats, flexbox, tables, or any other CSS technique. src

Susy is Flexible and lightweight library that you can use with float, flexbox or any CSS.