React

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

Adobe's design system behind its creative and document products, with shared foundations, tokens, and component implementations for React and Web Components.

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

The open source design system AWS uses for its consoles, offering accessible React components, interaction patterns, and design resources for complex web applications.

Ant Group's enterprise design language and widely used React component library, with token-based theming and companion projects for charts, mobile, and admin apps.

The Swedish Public Employment Service's design system, with a Figma UI kit, design tokens, and Stencil web components usable from Angular, React, or plain HTML.

Atlassian's unified design language for Jira, Confluence, and its other apps, covering tokens, components, accessibility, and AI patterns for its Rovo experiences.

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.

Elastic's EUI framework, the React component library and design system behind Kibana and other Elastic products, with tokens, patterns, and data visualization guidance.

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.

Lemon Squeezy's open source Wedges library, a growing set of React components built on Radix primitives and Tailwind CSS, with a matching Figma kit.

Duet, the design system behind LocalTapiola and Turva digital products, offering web components, a CSS framework, and design tokens with accessibility built in.

Meta's open source Astryx design system, a fully customizable, agent-ready React component library built on React 19 and StyleX, currently in beta.

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.

Motorway's design system, The Highway Code, helping teams design and build consistent car-selling experiences with Figma libraries and React components.