Originally Published Nov 14 2017, updated Dec 09 2018
Atomic Bulldog Grid is a CSS(SCSS) library to generate modern, responsive, flexible grid layout using the CSS Grid Layout technology. The library also provides a fallback that uses CSS flexbox.
BackPack.css is a small CSS grid framework which helps you generate a fully responsive, 12-column based grid layout for modern web design.
SMART CSS GRID is an ultra-light (~0.5kb minified) CSS grid framework to create responsive, flexible, fluid, 12-column grid layout for your modern web app.
Yet another CSS framework to create a responsive, justified/fluid grid of elements using CSS flexbox. Just weights in 0.3kb (minified) and super flexible.