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ReUI is a free, open-source React component library for the shadcn/ui ecosystem, developed by Keenthemes. It provides more than 1,000 copy-and-own registry examples across 71 categories, presented in realistic dashboard layouts rather than isolated demos, including data grids, filters, timelines, steppers, trees, calendars, kanban boards, and other interface blocks. The components are composed from shadcn/ui primitives and Tailwind CSS, with 19 custom in-house component types. Its Data Grid uses TanStack Table and virtualization and supports features such as drag-and-drop, pinning, resizing, and infinite scrolling. The in-house components have both Radix UI and Base UI versions and are distributed as TypeScript source through the registry rather than as an npm package, allowing the source to be copied into a React project. ReUI is released under the MIT License.

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.

React is a JavaScript library for building web and native user interfaces. It uses declarative views that update the appropriate components when application data changes, and lets developers compose encapsulated, state-managing components into larger interfaces. React code can use JSX, an HTML-like syntax for defining interface elements, although JSX is optional. The library is designed for gradual adoption, can render on the server with Node, and supports mobile applications through React Native. Its core repository is developed openly on GitHub under the MIT license.

motion-panels is an unstyled, framework-agnostic panel-layout library with a React adapter. Its core uses the DOM for resizing and Motion for animated folding, collapsing, pinning, and snapping, without relying on a layout library. Panels support pixel or percentage sizing, nesting, separator intersections, keyboard controls, right-to-left layouts, and live size updates; the package is distributed through pnpm and can also be added through shadcn. It is licensed under the MIT License.