Responsive Dynamic Justified Grid Layout Plugin – uhugrid
Easy Responsive Masonry Grid Library – Stackgrid
Flexible 12-column CSS Grid System
A CSS-only 12-column grid system for web designers and developers to create responsive and flexible layouts using CSS Grid.
Create Masonry Layouts Based On CSS Grid Values – JS Masonry
Minimalist Masonry Gallery Layout With CSS Grid – mm-masonry.css
A CSS library that makes use of CSS Grid to create flexible, fluid, Masonry-style image grids similar to Pinterest and Tumblr layouts.
Tiny Responsive Masonry Grid Library – stack-up.js
Lightweight Mobile CSS Layout Library – flex.css
flex.css is a lightweight CSS library that makes it easier to generate responsive, complex, cross-platform web layout for both desktop and mobile.