Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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TypeScript
A strongly typed superset of JavaScript that compiles to clean, portable JavaScript.
ESLint
The pluggable JavaScript and TypeScript linter that finds and fixes code problems through a fully customizable, plugin-based rule engine.
prettier
An opinionated code formatter that enforces consistent style across every language your project speaks.
typescript-eslint
The official meta-package bundling the TypeScript ESLint parser, plugin, and rule presets behind a single typed config() helper.
Playwright
Cross-browser end-to-end web testing and browser automation with a single API for Chromium, Firefox, and WebKit.
Express
The fast, unopinionated, minimalist web framework for Node.js
esbuild
An extremely fast JavaScript and CSS bundler and minifier written in Go.
posthog-js
The official browser SDK for PostHog — autocapture, session replay, feature flags, and surveys in one drop-in script.
AWS SDK for JavaScript (S3 Client)
The official modular AWS SDK v3 client for Amazon S3, with TypeScript-first APIs and streaming support.
eslint-plugin-react
React-specific linting rules for ESLint that catch JSX bugs, enforce Hooks conventions, and keep prop usage consistent.
eslint-plugin-import
ESLint rules that validate ES module import/export syntax and catch broken paths before they hit your build.
Sentry JavaScript (@sentry/browser)
The official Sentry SDK for capturing errors, performance traces, and session replays in browser JavaScript apps.
pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
Storybook
The industry-standard workshop for building, documenting, and testing UI components in isolation, across every major frontend framework.
webpack
A static module bundler that builds a dependency graph of your project's modules and packages them into optimized browser bundles
Uvicorn
A lightning-fast ASGI server for Python, built on uvloop and httptools.
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.
Electron
Build cross-platform desktop apps with JavaScript, HTML, and CSS on Chromium and Node.js
boto3
The official AWS SDK for Python — call every Amazon Web Services API from your code.
OpenAI Python SDK
The official Python library for the OpenAI REST API, generated from OpenAI's OpenAPI spec with typed sync and async clients.
TanStack Router
A fully type-safe React router with built-in data loading, caching, and URL search-param validation.
SWC
Rust-based JavaScript/TypeScript compiler, a drop-in super-fast alternative to Babel
Ruff
An extremely fast Python linter and code formatter, written in Rust, built as a drop-in replacement for Flake8, Black, isort, and dozens of plugins.
