React

Nordhealth's Nord Design System, production-grade web components, design tokens, Tailwind CSS support, and Figma toolkit behind its healthcare software products.

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

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

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.

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.

Sprout Social's Seeds creative hub, covering brand, visual and writing guidelines, patterns, and Racine, the company's library of reusable React components.

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.

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.

Uber's Base design system, the unified framework defining user interface foundations across Uber's products, with Base Web as its open source React implementation.

Vercel's Geist design system for consistent web experiences, documenting brand assets, a high-contrast color system, grid, icons, and React components.

Visa's Product Design System for inclusive digital experiences, offering guidelines, design kits, and Nova libraries for React, Angular, Flutter, and CSS.

The Washington Post Design System, a growing library of design tokens and interactive components purpose-built for washingtonpost.com reader experiences.

Wanda, Wonderflow's open source design system for its digital products, with brand foundations, symbols, motion, themes, design tokens, and React components.

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

Radix, maintained by WorkOS, offers free, open source React themes, unstyled primitives, icons, and color scales for building high-quality, accessible interfaces.

Zendesk Garden, the design system where Zendesk grows the components, standards, and tools its product teams use daily, now on version 9.