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
tsx
A drop-in replacement for the node CLI that runs TypeScript and ESM files instantly, powered by esbuild.
posthog-js
The official browser SDK for PostHog — autocapture, session replay, feature flags, and surveys in one drop-in script.
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.
pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
HTTPX
A next-generation HTTP client for Python with sync, async, and HTTP/2 support
Uvicorn
A lightning-fast ASGI server for Python, built on uvloop and httptools.
NumPy
The fundamental N-dimensional array library powering Python's scientific computing stack.
PyYAML
A full-featured YAML parser and emitter for Python, with C-accelerated bindings
FastAPI
A modern, high-performance Python web framework for building APIs with automatic validation, serialization, and interactive docs.
python-dotenv
Load environment variables from a .env file into Python's os.environ, the standard way to keep 12-factor config out of your code
undici
A fast, spec-compliant HTTP/1.1 client for Node.js, built from scratch with zero runtime dependencies
css-loader
Resolves CSS @import and url() like JavaScript imports so webpack can bundle stylesheets and their assets.
pandas
The Python DataFrame library for fast, flexible, and expressive data analysis and manipulation.
Pillow
The friendly PIL fork that adds image processing capabilities to Python
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.
style-loader
A webpack loader that injects bundled CSS into the DOM using style or link tags at runtime.
cryptography
The standard cryptographic library for Python, pairing safe high-level recipes with low-level primitives backed by Rust and OpenSSL.
babel-loader
Babel loader for webpack (and Rspack) that transpiles modern JavaScript with filesystem caching and source map support.
Click
A composable Python toolkit for building command line interfaces with minimal boilerplate.
urllib3
A powerful, user-friendly HTTP client for Python with thread-safe connection pooling, TLS verification, and retry handling.
sass-loader
Compiles Sass and SCSS files to CSS inside a webpack build, wiring in Dart Sass or Sass Embedded automatically.
python-dateutil
Powerful extensions to Python's datetime module for parsing, deltas, recurrence, and timezones.
