Open source. Open possibilities.

The open-source codebase and curriculum for freeCodeCamp.org, a non-profit platform providing free, self-paced certifications in full-stack web development and machine learning.

A popular open-source guide to 33 essential JavaScript concepts, with clear explanations, code examples, and curated resources. It has grown beyond the original list and is available in 40+ translations.

Signale is a highly configurable Node.js logging library offering 19 built-in loggers, custom pluggable loggers, scoped logging, interactive mode, secrets filtering, timers, and multiple writable streams with clean terminal output.

NexusMind is a production-grade AI model proxy service that aggregates multiple AI providers into a single OpenAI-compatible API interface.

Egg is an enterprise-grade Node.js framework built on Koa, offering built-in process management, a plugin system, and framework customization for building scalable server applications.

Valyrian.js is a lightweight, isomorphic frontend framework designed to build PWAs with a single codebase that runs in both the browser and Node.js.

Ditto scans JavaScript/TypeScript repositories with ts-morph, fingerprints each function through an LLM, clusters behavioural duplicates by embedding, then executes pure functions in a sandbox to show where they diverge.

NodeGUI is a library for building cross-platform native desktop applications with Node.js and CSS-like styling, powered by Qt6 for low CPU and memory usage. It offers complete Node.js API support, Flexbox layout, TypeScript support, and React/Vue/Svelte variants.

A code beautifier for JavaScript, CSS, and HTML that reformats and re-indents code with extensive configuration options. Available as a CLI tool, Node.js library, Python package, and web library.

Dembrandt is a Node.js CLI that renders a site with Playwright, reads computed DOM styles, and turns colors, typography, spacing, borders, shadows, motion and components into W3C design tokens, with CI drift gates and MCP support.

Fastify is a fast, low-overhead web framework for Node.js with a powerful plugin architecture, JSON Schema-based validation and serialization, and built-in Pino logging. It is extensible via hooks, plugins and decorators, and is maintained as an OpenJS Foundation project.

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.

A collection of coding articles and snippets designed to help developers improve their skills through practical examples and explanations.

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.

A 100% Rust reimplementation of PlantUML aiming for behavioral parity with the Java original. Currently supports sequence diagram parsing, SVG rendering, and preprocessor features. Includes language bindings for Java (JNI) and TypeScript (WASM), with Python planned.

CLI tool for generating, building, and releasing oclif-based command line interfaces. Supports Node 18+, consolidates commands from oclif v1 and oclif-dev. Includes generation, packaging, and publishing features.

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.

Microsandbox runs untrusted workloads in fast, local microVMs with hardware isolation. Supports Docker-like workflows, instant startup, and embeddable SDKs for AI agents, CI jobs, and automation across Linux, macOS, and Windows.

Open-source documentation website for Harper, a fullstack serverful Node.js application platform. Built with Docusaurus and hosted at docs.harper.fast. Community contributions welcome via issues and pull requests.

TangleClaw is an AI coding session orchestrator for macOS that wraps Claude Code, Codex, Antigravity, Aider, and OpenClaw sessions in persistent tmux processes. It provides session continuity, structured wrap summaries, searchable history, secure remote access via Caddy, inter-session agent messaging, and a dashboard PWA — all with zero npm dependencies.