CUI

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.

ThreeUI is a free, open-source, login-free catalog and React component library for interactive Three.js, WebGL, shader, and UI components. Its Community edition provides browsing, search, themes, responsive layouts, live renderers, controls, variant pickers, source-code tabs, and complete Community component source code, while excluding Pro and Beta components and authentication, checkout, and Pro implementation source. The public library can be installed from npm as @designcodeio/threeui and imported as React components with shared styles through the package root or component subpaths, or run locally with Vite from the repository. Components that render full HTML documents require runtime assets to be copied into the host application's public directory. Application code and Community component code are MIT licensed; bundled fonts use the SIL Open Font License 1.1 and bundled Three.js runtime files use the MIT license.

Dear ImGui is a self-contained, immediate-mode graphical user interface library for C++ developed for programmer-facing tools rather than typical end-user applications. Programs call UI functions each frame so the interface reflects live application state, making it suited to game-engine tooling, content-creation tools, visualization and debugging interfaces, real-time 3D applications, and embedded or fullscreen software. The library generates optimized vertex buffers that applications can render through their own 3D pipeline. Its core consists of platform-agnostic C++ source and header files that can be compiled directly into an existing project; platform and graphics API backends are provided separately, and custom backends can be used wherever textured triangles can be rendered. It is renderer-agnostic, portable, and has no external dependencies. Dear ImGui is distributed under a free, permissive license. The project emphasizes minimal state synchronization, setup, and maintenance, but does not provide some features common in higher-level GUI libraries, including full internationalization and accessibility support.

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.

GPUI Kit is an open-source Rust framework for building cross-platform desktop applications with GPUI. It provides a single dependency that re-exports the matching GPUI release, base infrastructure, styled components, and assets. Its architecture separates gpui-base for unstyled behavior, state, and infrastructure; gpui-component for the complete styled UI system; and gpui-shell for JavaScript extensions hosted by a Rust application. The project includes more than 75 documented components and primitives, data tables, virtual lists, a code editor, dock layouts, Markdown and HTML rendering, syntax highlighting, and charts. Applications can target macOS, Windows, Linux, and WebAssembly. The interaction layer includes AccessKit accessibility support, while its UI integration tests render components in headless windows and exercise pointer and keyboard input while checking state, focus, layout, and accessibility. The repository includes a component showcase and standalone examples, including dock layouts, editors, Markdown, and HTML rendering. Software source and code examples are licensed under Apache-2.0; specified documentation prose and illustrations are also offered under CC BY 4.0.