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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Playwright
Cross-browser end-to-end web testing and browser automation with a single API for Chromium, Firefox, and WebKit.
date-fns
Modern JavaScript date utility library with 200+ pure, immutable functions
React Testing Library
Simple and complete React DOM testing utilities that encourage good testing practices.
Lodash
A modern JavaScript utility library delivering modularity, performance, and extras for arrays, objects, and functions.
jest-dom
Custom Jest matchers for asserting on the state of the DOM in your tests.
@babel/core
The core JavaScript compiler that transforms next-generation syntax into code every browser and runtime can understand.
jest
Delightful JavaScript testing with zero-config setup, snapshots, mocking, and coverage
posthog-js
The official browser SDK for PostHog — autocapture, session replay, feature flags, and surveys in one drop-in script.
eslint-plugin-import
ESLint rules that validate ES module import/export syntax and catch broken paths before they hit your build.
user-event
Simulates the full sequence of real browser events so Testing Library tests behave the way an actual user does.
Requests
The elegant, human-friendly HTTP library that made Python's most-used API for talking to the web.
Pydantic
Data validation and settings management using Python type hints, backed by a Rust core.
testify
The essential Go toolkit for assertions, mocks, and structured test suites.
pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
DOM Testing Library
Simple, framework-agnostic DOM query utilities that test your UI the way real users interact with it.