Storybook

Aalto University's brand library and design system, pairing visual identity rules with design tokens and a React component Storybook for university web services.

The Australian agriculture department's open source design system for import and export services, offering accessible React components, templates, and a starter kit.

Basis Technologies' design system for its advertising software, combining visual and experience guidelines, tokens, components, and content design rules for product teams.

Brainly's PENCIL hub, a single source of truth for brand, marketing, and product design, from logos and color tokens to UX guidance and components.

The U.S. Centers for Medicare & Medicaid Services' open source design system for Section 508 compliant, responsive sites, with themes for CMS.gov, HealthCare.gov, and Medicare.gov.

Finnish telecom Elisa's design system, combining design, code, and UX guidelines with a component library in Figma and Storybook plus beta Flutter tokens.

GE HealthCare's Ethos Design System (EDS, formerly Edison), shared design and code standards for clinical software, medical device screens, and digital brand touchpoints.

GitHub's open source design system, with Primer Product UI and Brand UI, Primitives design tokens, Octicons, and accessibility guidance for building GitHub.

The City of Helsinki's open source design system, bringing guidelines, design assets, and component libraries together for a consistent, accessible digital city brand.

IBM's open source design system built on the IBM Design Language, with React and Web Components libraries, design kits, guidelines, and an active contributor community.

Kajabi's Sage design system, the source of truth for its creator platform, with components written for both Rails and React plus Sass-based foundations.

Kiwi.com's open source Orbit design system for travel products, with React components, design tokens, Tailwind presets, and a free public Figma library.

Microsoft's Fluent 2 design system for moving fluidly between design and code across web, iOS, Android, and Windows, with tokens, components, and AI guidance.

monday.com's Vibe design system, official React UI resources for building monday.com apps, documented in Storybook with foundations, theming, hooks, and an MCP server.

MongoDB's open source LeafyGreen design system and React UI kit, now in maintenance mode as new MongoDB products move to its successor, Via.

Pluralsight's Pando design system, the successor to its classic library, with React components, themes, icons, specs, and usage guidelines for its learning platform.

Razorpay's open source Blade design system, documented in Storybook with tokens, theming, motion, accessible components, and an MCP server for AI-assisted building.

SumUp's open source Circuit UI, a React component library and design system for the web, documented in Storybook with tokens, icons, and forms.

Ahoy, Teamleader's design system for building user-friendly, consistent interfaces across its CRM products, with foundations, components, governance, and accessibility guidelines.

Workday's open source Canvas design system, reusable UI elements, tokens, icons, and guidelines delivered through the Canvas Kit React libraries.