Sass

color shades generator tool to easily generate color shades and tints from color hex code and export for css, sass, tailwind colors

Vanilla Framework - a simple extensible CSS framework, written in Sass, by the Ubuntu Web Team.

Front end style guide generator and Sass partial manager. Atomic Docs is built with Sass and PHP

Style guide for Pivotal UI, design system and component library of Pivotal Software

This design system documents the styles, components and templates available to use on your website.