bullframe.css
Bullframe CSS is a lightweight Sass (SCSS) framework for building fast, responsive, and accessible UIs — semantic, themeable, and classless-friendly, with solid cross-browser support.
gerillass
Gerillass is an open-source toolkit that contains a set of Sass mixins to help designers and developers to create better, faster and consistent user interfaces.
madosel
The most and fast advanced responsive html front-end framework.