Open Source Packages

Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.

5929 packages

Kind

postcss

A CSS transformation engine that parses styles into an AST, letting JS plugins lint, prefix, and rewrite CSS — the foundation beneath Autoprefixer, Tailwind, and 200+ other tools.

typescript-eslint

The official meta-package bundling the TypeScript ESLint parser, plugin, and rule presets behind a single typed config() helper.

Axios

Promise-based HTTP client for the browser and Node.js with interceptors, automatic transforms, and cancellation

Express

The fast, unopinionated, minimalist web framework for Node.js

Marked

A fast, low-level Markdown compiler that parses CommonMark and GFM into HTML in Node.js, browsers, or the CLI.

js-yaml

A fast, complete YAML 1.2 and 1.1 parser and serializer for JavaScript.

yaml

A definitive TypeScript parser and stringifier for YAML, supporting 1.1 and 1.2 with comment and CST access.

Commander.js

The complete, battle-tested framework for building Node.js command-line interfaces.

OpenTelemetry JavaScript (@opentelemetry/api)

Vendor-neutral tracing, metrics, and context API that libraries and apps instrument once, so any OpenTelemetry-compatible backend can consume it.

Stripe Node.js Library

The official Node.js and TypeScript library for the Stripe API, giving developers a fully typed client for payments, billing, and Connect.

FastAPI

A modern, high-performance Python web framework for building APIs with automatic validation, serialization, and interactive docs.

Oxlint

Rust-based JavaScript/TypeScript linter that runs 50-100x faster than ESLint, with zero configuration required.

url

A WHATWG-standard-compliant URL parser and manipulation library for Rust.

PapaParse

The fastest in-browser CSV parser for JavaScript, with streaming, Web Workers, and zero dependencies

MSW (Mock Service Worker)

Seamless REST and GraphQL API mocking for browser and Node.js

SWC

Rust-based JavaScript/TypeScript compiler, a drop-in super-fast alternative to Babel

Clap

The most widely used command-line argument parser for Rust, with both derive and builder APIs.

markdown-it

A fast, pluggable CommonMark-compliant Markdown parser and renderer for JavaScript, safe by default.

Cheerio

The fast, flexible library for parsing and manipulating HTML and XML with a familiar jQuery-style API.

yargs

The modern, pirate-themed command-line argument parser and command framework for Node.js

sanitize-html

Allowlist-based HTML sanitizer that strips XSS vectors from untrusted markup while preserving the tags and attributes you choose to keep.

@slack/web-api

Slack's official Node.js HTTP client for calling any of the 270+ Web API methods, with built-in queuing, retries, pagination, and rate-limit handling.