Raster is a pure CSS layout system that makes it simple to generate a responsive modern grid layout using descriptive HTML and CSS Grid Layout.
infinity-css-grid is an ultralight (less than 0.1kb ) CSS layout system that helps web developers quickly generate responsive, flexible grid layout using CSS flexbox.
Flex One is a dead simple CSS class to create infinite responsive grid systems based on CSS flexbox layout.
CSSGridSys is a small CSS library used for creating responsive, cross-platform, 12-column grid layout for modern web design.
BackPack.css is a small CSS grid framework which helps you generate a fully responsive, 12-column based grid layout for modern web design.