Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
All Packages
Category
Sort:Used by Most Apps
Tailwind CSS
A utility-first CSS framework for rapidly building custom user interfaces without leaving your markup.
prettier
An opinionated code formatter that enforces consistent style across every language your project speaks.
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.
dotenv
Loads environment variables from a .env file into process.env for Node.js apps.
tailwind-merge
Merge Tailwind CSS classes without style conflicts
date-fns
Modern JavaScript date utility library with 200+ pure, immutable functions
jsdom
A pure-JavaScript implementation of the WHATWG DOM and HTML standards for Node.js.
Autoprefixer
Parses your CSS and automatically adds vendor prefixes using real-world browser usage data from Can I Use.
Axios
Promise-based HTTP client for the browser and Node.js with interceptors, automatic transforms, and cancellation
class-variance-authority
A tiny TypeScript utility for building type-safe, variant-driven className APIs on top of clsx.
Express
The fast, unopinionated, minimalist web framework for Node.js
esbuild
An extremely fast JavaScript and CSS bundler and minifier written in Go.
AWS SDK for JavaScript (S3 Client)
The official modular AWS SDK v3 client for Amazon S3, with TypeScript-first APIs and streaming support.
ws
A simple, blazing-fast, thoroughly tested WebSocket client and server library for Node.js.
Requests
The elegant, human-friendly HTTP library that made Python's most-used API for talking to the web.
sharp
High-performance Node.js image processing powered by libvips, built for fast resizing and format conversion.
i18next
The internationalization framework for JavaScript, with zero runtime dependencies and a pluggable ecosystem for every environment.
Sass
The reference Dart implementation of Sass, the mature CSS preprocessor that compiles SCSS and indented syntax to standards-compliant CSS.
Pydantic
Data validation and settings management using Python type hints, backed by a Rust core.
pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
tailwindcss-animate
Tailwind CSS plugin for enter and exit animations using utility classes
tw-animate-css
A pure-CSS, Tailwind CSS v4 compatible replacement for tailwindcss-animate.
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.
OpenAI
The official Node.js/TypeScript client for the OpenAI API, auto-generated from OpenAI's own OpenAPI spec.
