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shadcn/ui is an open-source collection of accessible UI components and a code distribution platform for building custom component libraries. It distributes component source code directly into consuming projects, where developers can customize, extend, and build on the components across supported web frameworks. Documentation is available at ui.shadcn.com/docs, and the project is licensed under the MIT license.

Moumen Lab is a React component registry for interface components such as menus, OTP inputs, upload staging, command palettes, and draggable reorderable lists. Components are distributed in the shadcn registry format and installed as source code with the `moumenlab` CLI or shadcn CLI, so no runtime package is required. The components use Tailwind CSS with shared `lab-theme` tokens and motion-based animations that are interruptible, layout-aware, and reduced-motion aware. The repository includes live showcases, component blueprints, source files, registry metadata, and a monorepo-based CLI; it targets React 19, Tailwind CSS v4, Node.js 18+ for installation, and is licensed under MIT.

Arc Library is an open-source React component and block library by Elia Kuratli, providing interfaces with calm physical motion, keyboard support, and a reduced-motion path for every animation. Components use CSS modules with shared design and motion tokens, and can be installed through the shadcn CLI or copied into a project as source code; there is no runtime package to keep synchronized. It supports Next.js and Vite with or without Tailwind, and includes controls, inputs, overlays, feedback elements, data visualizations, tables, media components, text effects, and complete interface blocks. The free repository is MIT licensed. Components use Motion for animation and may use lucide-react or Radix UI primitives; theming is controlled through semantic CSS variables with separate light and dark values. Arc also provides an MCP server and machine-readable documentation for AI coding tools, while paid Arc Pro components are distributed separately.

pdfcn is a free, open-source library of customizable PDF components for React, designed in the style of shadcn/ui. It uses a registry format and CLI workflow for copying components into an application, where they can be customized and composed into tables, forms, charts, invoices, reports, and other documents. PDFs can be rendered through either Takumi or Forme. The project provides zero-configuration defaults, live previews in its documentation, shared themes and props, and composable React components with renderer primitives. It is licensed under the MIT License.

Amicro (@subhanhq/amicro) is an open-source React library of micro-interactions, transition components, Motion-powered primitives, custom hooks, spring presets, and animated card layouts. Its components are copied as TSX source into a project rather than delivered as a runtime service, with support for React, Next.js, and Vite applications using Tailwind CSS and Motion or framer-motion. The library includes entrance transitions such as fade-in, fade-up, and zoom-in; interaction components such as tilt-card and magnetic-button; text-reveal effects; scroll-progress utilities; and card layouts including fanned arcs, corner fans, cascades, radial wheels, scatter spreads, interactive 3D carousels, CoverFlow, and a timeline-controlled perspective stack. The npm CLI initializes project configuration and adds individual components, hooks, or utilities. Components can also be installed through a shadcn/ui registry using direct raw URLs or the @amicro namespace. The project supports light and dark UI palettes, requires Node.js 18 or later, and is distributed under the MIT License. It was created by Syed Subhan, associated with Subhan-code.