Directory

Open Source Packages

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

5921 packages

All Packages

Showing 15 of 5921 packages
96Health
Toolnpm

TypeScript

A strongly typed superset of JavaScript that compiles to clean, portable JavaScript.

110,944
Apache 2.0
Used by 469
97Health
Librarynpm

React

The declarative, component-based JavaScript library for building fast, interactive user interfaces on the web and in native apps.

249,163
MIT
Used by 381
97Health
Librarynpm

React DOM

React's official renderer for the DOM and server — createRoot, hydrateRoot, and streaming SSR in one package.

249,163
MIT
Used by 376
94Health
Toolnpm

ESLint

The pluggable JavaScript and TypeScript linter that finds and fixes code problems through a fully customizable, plugin-based rule engine.

27,495
MIT
Used by 351
90Health
Librarynpm

Tailwind CSS

A utility-first CSS framework for rapidly building custom user interfaces without leaving your markup.

97,463
MIT
Used by 319
93Health
Toolnpm

Vite

Next-generation frontend build tool with an instant dev server, lightning-fast HMR, and optimized production builds.

82,738
MIT
Used by 302
90Health
Toolnpm

prettier

An opinionated code formatter that enforces consistent style across every language your project speaks.

52,238
MIT
Used by 300
92Health
Toolnpm

Vitest

A blazing-fast unit testing framework powered by Vite, with Jest-compatible APIs out of the box.

17,062
MIT
Used by 276
92Health
Librarynpm

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.

28,977
MIT
Used by 268
90Health
Librarynpm

Zod

TypeScript-first schema validation with static type inference and zero dependencies.

43,861
MIT
Used by 259
94Health
Toolnpm

typescript-eslint

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

16,387
MIT
Used by 249
42Health
Librarynpm

clsx

A tiny, fast utility for conditionally constructing className strings

9,836
MIT
Used by 237
75Health
Librarynpm

dotenv

Loads environment variables from a .env file into process.env for Node.js apps.

20,532
Other
Used by 220
91Health
Frameworknpm

Playwright

Cross-browser end-to-end web testing and browser automation with a single API for Chromium, Firefox, and WebKit.

95,722
Apache 2.0
Used by 213
88Health
Librarynpm

tailwind-merge

Merge Tailwind CSS classes without style conflicts

5,684
MIT
Used by 202

Join founders buildingwith open source

Opinionated takes, migration guides, cost-saving tips, and insights from the open source ecosystem.

Subscribe on Substack
Join 750+ subscribers

Search