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W3C Design System
Public design system behind w3.org with documented layouts, components, scripts, and templates. Its September update adds fluid type, logical properties, cleaner markup, and more flexible spacing.
More Design Systems(4)
Astryx
Open-source React 19 design system from Meta with 150+ accessible components, seven themes, templates, and a CLI. Shared conventions and documentation support people and coding agents.
B.C. Design System
Province of British Columbia design system with Figma tokens, CSS and JavaScript variables, and React components for consistent government service interfaces.
Carbon Design System: Elevate Your Design Workflow for Free
Carbon is IBM's open-source design system providing production-ready React and Web Components, Figma kits, design tokens, and comprehensive guidelines. Built on the IBM Design Language, it's a mature, well-documented system ideal for enterprise applications.
Design Principles FTW: Comprehensive Collection of Design Principles
A curated archive of design principles from teams across the industry — Apple, Google, GOV.UK, and hundreds more. Browse by company or principle type to find inspiration for establishing your own team's design values and decision-making framework.