Public repository

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.

Mozilla's Protocol design system for Mozilla and Firefox websites, providing a common design language, reusable coded components, and content and accessibility guidelines.

New York State's shared library of accessible web components, design tokens, and guidelines for agencies building mobile-friendly digital services.

The NSW Government's open source digital design system, a toolkit of core styles, components, templates, and guidance for distinctly NSW digital services.

The Government of Ontario's design and coding standards for building public products, with documented components, release notes, and web component packages.

Orange's toolkit of design guidelines and interface components for web, Android, iOS, and Flutter, with Figma UI kits and open source development libraries.

Palantir's open source Blueprint toolkit, a React-based UI library optimized for complex, data-dense desktop web applications, now on version 6.

Porsche's toolkit for high-quality web applications, with Figma libraries, web components wrapped for React, Angular, and Vue, and brand-driven UX guidelines.

Power Home Remodeling's open source Playbook design system, with matching components for React, Ruby on Rails, and Swift plus Figma resources and theming.

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

Red Hat's open source PatternFly design system for enterprise products, with HTML and React implementations, charts, design tokens, and extensive usage guidance.

REI Co-op's open source Cedar design system, with Vue 3 components, design tokens for web, iOS, and Android, and guidance for accessible, responsive experiences.

Salesforce's Lightning Design System, now SLDS 2, offering styling hooks, utility classes, icons, accessibility rules, and AI design guidance for building on Salesforce.

The SAP Design System, home of SAP Fiori for web, iOS, and Android plus the SAP Digital Design System, built for accessible, enterprise-grade experiences.

SEEK's open source Braid design system, a themeable set of accessible React components, patterns, templates, and styling primitives for SEEK Group products.

Segment's Evergreen, an open source React UI framework for ambitious web products, with polished components that work out of the box and compose freely.

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

Tailwind CSS, the utility-first CSS framework for building any design directly in markup, with a configurable theme that acts as a shared design token layer.

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

Thumbtack's Thumbprint design system, assets and guidelines for consistent experiences across web, iOS, and Android, including tokens, components, atomic CSS, and content design.

Paste, the open source design system created at Twilio, with accessible React components, tokens, icons, patterns, and page templates for consistent product experiences.

The U.S. federal government's design system for building accessible, mobile-friendly websites, with components, design tokens, patterns, and implementation guidance.