Cloudscape is AWS's open-source design system, built in 2016 for its own web console products, now available publicly with 60+ React components, 30+ pattern guidelines, and full Figma resources.
It's strongest for dense, data-heavy application UI (tables, forms, dashboards) since it was purpose-built for AWS's own console, and it ships dark mode and adjustable content-density settings out of the box, not merely light-mode defaults.
Developers and designers building complex admin dashboards or SaaS consoles who want a system proven at the scale of AWS's own product suite.
It's genuinely open source and installable via npm, not merely a documentation site to browse, so components can be adopted directly rather than only referenced for inspiration.
AWS's own design system, with components and dev tools for building accessible web apps.
