Design System GitHub Repositories (2026) · Open Source Tools

React port of Rocket.Chat's design system, Fuselage

💎 An accessible, theme-ready design system built for learning applications and Open edX.

Tonic UI is a UI component library for React, built with Emotion and Styled System. It is designed to be easy to use and easy to customize.

A free, open-source add-on for Claude, ChatGPT, Codex and Cursor that turns a few plain answers into a design system, so everything you build looks like it belongs together.

Build web applications that meet the Royal Navy service standards.

🎨 Wanted Web Design System - Montage

ABC Def is an efficient design system using a three-tier token structure and Headless UI to create web components with consistent design and flexible customization.

🐼 Universal, Type-Safe, CSS-in-JS Framework for Design Systems ⚡️

Keeps coding agents on your design system: catches palette colors, native elements and APIs your system lacks, at every edit and pull request, with the fix. Set it up once in your design-system package; every app in your monorepo gets it.

Open-source React UI components for developers and AI agents. Typed APIs, design tokens, and source code you can customize.

MCP server and design skill that grounds coding-agent UI work in real product screens. Two tools, npx-installable.

shadcn/ui for SwiftUI. Beautiful copy-paste components for iPhone, iPad and Mac that you own. Native controls, themes, dark mode, Dynamic Type.

Talend's unified web UI repository. Status: Maintenance

ViewComponents for the Primer Design System

Themeable design system for the SEEK Group