Develop – Carbon Design System

Cedar Design System | REI Co-op

Mozilla Protocol - Protocol Design System

Microsoft Design

CSS Style Guides - dailydevlinks.

Spotify Design - Articles

Evergreen

Duolingo: Design Guidelines

Nachos | Trello

Getting Started — Ring UI

Design Resources

wearehive/project-guidelines: A set of best practices for JavaScript projects

wearehive/project-guidelines: A set of best practices for JavaScript projects

How Branding Tripled My Income in Six Months – prototypr

alexpate/awesome-design-systems: 💅🏻 ⚒ A collection of awesome design systems

Shopify Polaris

Website Style Guide Resources

Brand.ai - Establish a consistent brand everywhere | Brand.ai

Design Guidelines — The way products are built.

Cyclotron

Ant Design of React - Ant Design

Draft U.S. Web Design Standards | UI components

IBM Design Research

Shell Style Guide

Spec

Front end guild guides - Frontend Guides

Web Framework - Home

WhatsApp Brand Resources

aigis - CSS Styleguide Generator

the HTML/CSS Workmanship Guide

dropbox/css-style-guide

Ecmarkup

U.S. Web Design Standards | U.S. Web Design Standards

- 18F Guides

Trello CSS Guide

CSSを書く、設計する時に参考にしておきたいCSSのガイドライン・スタイルガイドのまとめ | コリス

Brand Guidelines | DesignPT Slack

Two.js

Find Guidelines - The fastest way to brand assets.

https://www.paypal-marketing.com/html/partner/na/portal-v2/pdf/PP_Masterbrandguidelines...

Mozilla Style Guide — Mozilla

Lonely Planet Travel Guides and Travel Information

brandcenterdl.adobe.com/Corpmktg/Brandmktg/Campaign_Assets/guidelines/corporate/corpora...

Styleguide

MailChimp Style Guide | MailChimp

Medium Style Sheet — Medium

Disqus Style

Sandstone introduction — Mozilla Style Guide — Mozilla

Dribbble - airbnb-web-toolkit.png by Derek Bradley

Style Guide

Case Study: Virgin America - Work & Co

Dribbble - Evernote Design

Uber Brand Guide - Hierarchy

Style Guides by Pro Designers – Inspiration Supply – Medium