Everything Open-Source.

Adobe

Spectrum Design System

Design System
React
Open-Source

Alibaba

Ant Design System

Design System
React
Open-Source

Apple

Apple Developer Design Guidelines

Design System
React
Open-Source

Atlassian

Atlassian Design System

Design System
React
Open-Source

Blueprint

React-based UI toolkit for the web

Design System
React
Open-Source

Cloudflare

cf-ui Design System

Design System
React
Open-Source

Chakra UI

Simple, modular and accessible component library

Design System
React
Open-Source

Evergreen

React UI Framework for the Web

Design System
React
Open-Source

Firefox

Photon Design System

Design System
React
Open-Source

GitHub

Primer Design System

Design System
React
Open-Source

Gitlab

Pajamas Design System

Design System
React
Open-Source

Google

Material Design System

Design System
React
Open-Source

HubSpot

Canvas Design System

Design System
React
Open-Source

IBM

Carbon Design System

Design System
React
Open-Source

JetBrains

Ring UI

Design System
React
Open-Source

Pinterest

Gestalt Design System

Design System
React
Open-Source

Pluralsight

Pluralsight Design System

Design System
React
Open-Source

Priceline

Priceline One Design System

Design System
React
Open-Source

Salesforce

Lightning Design System

Design System
React
Open-Source

Shopify

Polaris Design System

Design System
React
Open-Source

WeWork

Plasma Design System

Design System
React
Open-Source