Open source. Open possibilities.

Nx is a monorepo platform for TypeScript and polyglot codebases: a Rust-built, TypeScript-extensible core that caches what did not change, runs only affected tasks, and adds plugins plus an integrated, self-healing CI.

Novu is an open-source communication infrastructure that unifies notifications and agent messaging across Inbox, Email, SMS, Push, Chat, Slack, Teams and Telegram through one API and conversation model.

Omatsuri is a privacy-focused PWA bundling 12 open source frontend tools, including CSS generators, an SVG compressor and JSX converter, Base64 encoder, fake data and lorem ipsum generators. Everything runs in the browser with offline support.

An 'awesome' list collecting JavaScript frameworks, web component libraries, UI component libraries for React, Vue, Angular, and more, mobile UI components, admin templates, and icon libraries. It includes GitHub star and npm download badges, and covers both active and historically significant projects.

TanStack Query is an async state management library for the web that simplifies fetching, caching, synchronizing and updating server state, with adapters for React, Solid, Svelte and Vue.

Official LottieFiles web player for Lottie (.json) and dotLottie (.lottie) animations, with a Rust + WASM core, Canvas2D/WebGL2/WebGPU backends, runtime theming, state machines, audio, worker rendering, and React, Vue, Svelte, Solid and Web Component SDKs.

Storybook is a frontend workshop for building, documenting, and testing UI components and pages in isolation. It supports many frameworks and offers addons for accessibility, documentation, and interactive development.

Overflow is a cooperative credit ledger for open-source work: sponsors offer issues, contributors close them via GitHub, and the service records settled transfers with labels, comments, API tokens and MCP tools.

Braid is SEEK Group's themeable design system, distributed as a React component library. It provides themes, BraidProvider, and components styled with Vanilla Extract, with setup guidance for sku-based projects.

Autumn Note is a zero-dependency WYSIWYG rich-text editor in vanilla JavaScript. It offers formatting, tables, media, Markdown shortcuts, i18n, dark mode, accessibility, and React/Vue wrappers.

Happy DOM is a JavaScript implementation of a web browser's DOM without a graphical user interface, designed so browser-style code and component tests can run in runtimes like Node.js and Bun.

Priceline Design System is Priceline.com's open-source UI component library and design standard. It aims to unify interface patterns, speed design and development, and promote accessibility, internationalization, and responsive web design. It ships as the npm package pcln-design-system with Storybook docs and an MIT license.

Build interactive, responsive dashboards with drag-and-drop widgets. Supports Angular, React, Vue, and more. Mobile-friendly with TypeScript.

Headless UI offers completely unstyled, fully accessible UI components for React and Vue, designed to integrate with Tailwind CSS. Packages include @headlessui/react, @headlessui/vue, and @headlessui/tailwindcss. Full documentation at headlessui.com.

An animation-first React framework designed for high-fidelity visual websites, featuring persistent shells and live-tweakable motion tokens.

Next.js is Vercel's open-source React framework for building full-stack web applications. It extends the latest React features and integrates Rust-based JavaScript tooling for fast builds, and is used by some of the world's largest companies.

JSON Hero is an open-source web-based JSON explorer that lets you browse, search, and navigate JSON files through multiple view modes with content previews and related value scanning.

Recharts is an open-source chart library for React built on D3. It offers declarative, composable chart components rendered as native SVG with minimal dependencies, installable via npm, Deno or a UMD script tag, and documented with a storybook.

React Suite provides React UI components for building web applications. Supports major browsers and server-side rendering with Next.js. Includes installation via package managers and framework-specific guides.

Gatsby is a free, MIT-licensed open-source framework built on React for creating fast websites and apps. It loads data from Markdown, headless CMS, REST or GraphQL sources through source plugins behind a uniform GraphQL interface, and supports per-page SSG, DSG and SSR rendering with built-in code splitting, image optimization and prefetching.