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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.

Maersk Technology's design language, providing styles, tokens, themes, layouts, web components, icons, and content guidelines for consistent logistics products.

Michelin's design system for digital products, with a Figma UI kit, tokens, icons, accessibility guidance, data visualization rules, and Angular, Blazor, and Svelte resources.

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.

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.

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

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

Tractie, Dutch Railways' design system for internal employee applications, with fundamentals, components, patterns, and support for web, Mendix, and Android developers.

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

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.

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.

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.

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.

Shopify's Polaris, the unified UI framework built on web components that apps use across the Shopify Admin, Checkout, customer accounts, and POS.

Škoda's award-winning Flow design system, with UI libraries and guidelines for web, mobile apps, and in-car interfaces plus imagery and UX writing rules.