Directory

Open Source Packages

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

5929 packages

All Packages

86Health
Library PyPI

PyAV

Pythonic bindings for FFmpeg's audio, video, subtitle, and container libraries.

3,282
BSD 3
Used by 5
90Health
Library PyPI

fpdf2

A pure-Python library for generating and manipulating PDF documents, with text, images, tables, barcodes, SVG, and digital signing built in.

1,540
Other
Used by 5
41Health
Library PyPI

requests-toolbelt

A collection of utilities extending Python's Requests library for HTTP

1,039
Apache 2.0
Used by 5
79Health
Library PyPI

uuid-utils

A Rust-powered, drop-in replacement for Python's uuid module that generates UUIDv1-v8 much faster than the standard library.

372
BSD 3
Used by 5
65Health
Library PyPI

tinycss2

Low-level CSS Syntax Level 3 parser and generator for Python

190
BSD 3
Used by 5
87Health
Library PyPI

SQLModel

One model for SQLAlchemy and Pydantic, built by the creator of FastAPI to kill duplicate schema code.

18,323
MIT
Used by 4
89Health
Library PyPI

instructor

Get reliable, validated structured JSON from any LLM provider using Pydantic models and automatic retries.

13,890
MIT
Used by 4
84Health
Library Cargo

Apache DataFusion

The extensible, Arrow-native SQL and DataFrame query engine for building fast analytical systems in Rust.

9,310
Apache 2.0
Used by 4
88Health
Library PyPI

librosa

A Python library for audio and music signal analysis, providing the core DSP building blocks for music information retrieval (MIR) systems.

8,608
Other
Used by 4
82Health
Library PyPI

lark

A modern parsing toolkit for Python supporting Earley, LALR(1), and CYK parsers with automatic tree construction.

5,983
MIT
Used by 4
95Health
Library PyPI

FontTools

Python library for manipulating TrueType, OpenType, and other font formats

5,249
MIT
Used by 4
84Health
Library PyPI

types-pytz

PEP 561 type stubs that add static typing to the Python pytz timezone library

5,120
Apache 2.0
Used by 4
84Health
Library PyPI

types-toml

PEP 561 type stubs that add static typing to the Python toml library

5,120
Apache 2.0
Used by 4
56Health
Library PyPI

Flask-SQLAlchemy

The official SQLAlchemy integration for Flask, adding scoped sessions, multi-database binds, and Flask-aware model conventions.

4,307
BSD 3
Used by 4
67Health
Library PyPI

pycryptodome

A self-contained, low-level Python library of cryptographic primitives — ciphers, hashes, MACs, and public-key algorithms — with no OpenSSL dependency.

3,262
Other
Used by 4
74Health
Library PyPI

django-environ

Configure Django apps with twelve-factor environment variables and URL-based settings.

3,165
MIT
Used by 4
91Health
Library PyPI

kombu

A Python messaging library giving Celery and other apps one high-level API over AMQP, Redis, SQS, and a dozen other broker transports.

3,142
BSD 3
Used by 4
64Health
Library PyPI

mkdocstrings

MkDocs plugin that automatically generates API documentation from your source code and docstrings.

2,095
Other
Used by 4
87Health
Library PyPI

django-celery-beat

Store and manage Celery periodic task schedules in the Django ORM, editable from the Django admin.

1,953
BSD 3
Used by 4
47Health
Library PyPI

python-user-agents

Detects mobile, tablet, and PC devices — and their touch, bot, and browser capabilities — by parsing HTTP user agent strings.

1,514
MIT
Used by 4
66Health
Library PyPI

Flask-WTF

Simple integration of Flask and WTForms with built-in CSRF, file upload, and reCAPTCHA support

1,510
BSD 3
Used by 4
46Health
Library PyPI

Flask-CORS

Cross-Origin Resource Sharing (CORS) support for Flask applications

932
MIT
Used by 4
52Health
Library PyPI

jsonpath-ng

A standard-compliant JSONPath implementation for Python with arithmetic operators, AST manipulation, and in-place updates.

733
Apache 2.0
Used by 4
88Health
Library PyPI

Griffe

Extract signatures and structure from entire Python programs for API docs and breaking-change detection.

691
Other
Used by 4

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