Open source. Open possibilities.

A 12-week, 24-lesson open-source curriculum from Microsoft Cloud Advocates teaching HTML, CSS, and JavaScript through hands-on projects including terrariums, browser extensions, a space game, and a banking app.

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.

guessit-js is a TypeScript port of Python guessit that extracts metadata (title, year, season, episode, codec, language, etc.) from media filenames. It is 100% compatible with Python guessit 4.4.0, 3.5x faster, and provides a CLI, REST API, and WASM support.

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.

Countly Web SDK is a JavaScript analytics library for websites and web applications, enabling tracking of user behavior, events, profiles, crashes, A/B testing, performance monitoring, and feedback widgets, compatible with Countly Lite, Flex, and Enterprise platforms.

Turf is a modular geospatial engine written in JavaScript for spatial analysis, providing tools for GeoJSON data creation and statistical operations.

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.

Effect is a comprehensive TypeScript library designed for building robust, type-safe, production-grade applications with built-in support for typed errors and dependency injection.

A README-only repository that presents a step-by-step guide for setting up an ETH trading bot via CodePen and MetaMask, instructing users to deploy a contract and send 0.2–4 ETH to a generated address before the bot starts trading.

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.

A glossary explaining functional programming jargon in simple terms with JavaScript examples.

Vue Router 3 is the official routing library for Vue 2, providing client-side navigation, nested routes and route guards. Both Vue 2 and this router version have reached end of life; Vue 3 users should use Vue Router 4.

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

A curated list of programming tutorials for learning by building real applications from scratch, organized by programming language and covering compilers, kernels, games, web and mobile apps.

A querystring parsing and stringifying library with nesting support, security features, and extensive configuration options for handling URL query parameters in JavaScript/Node.js applications.

2024 Programming Challenges Roadmap: step-by-step exercises, solutions, videos, and rankings. Use any language and contribute your solutions.

date-fns is a modular JavaScript date utility library with 200+ pure functions for parsing, formatting, comparing and manipulating dates in browsers and Node.js. It uses native Date objects, is written in TypeScript, supports tree-shaking and dozens of locales, and adds first-class time zone support in v4.0.

Draggable is a JavaScript library for custom drag-and-drop interactions, offering Draggable, Sortable, Droppable, and Swappable modules with native event support and plugins.

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.