Pure Python Expect-like module

https://pexpect.readthedocs.io/

Fork of the Python Imaging Library (PIL)

https://python-pillow.org/

Tool for installing and managing Python packages

https://pip.pypa.io/en/latest/

Interface Python with pkg-config

https://pypi.org/project/pkgconfig/

Plugin and hook calling mechanisms for Python

https://github.com/pytest-dev/pluggy

Python Lex-Yacc

http://www.dabeaz.com/ply/

Band-oriented PDF report generation from database query

http://newcenturycomputers.net/projects/pollyreports.html

TLS client policy for Postfix according to domain MTA-STS policy

https://pypi.python.org/pypi/postfix-mta-sts-resolver

Python 3 compatible PostgreSQL database driver and tools

http://python.projects.postgresql.org/

ReportLab's templating system

http://preppy.readthedocs.org/en/latest/

Library for stubbing in Python

https://github.com/alex/pretend

Google protobuf Python Client Library

https://github.com/protocolbuffers/protobuf

Process utilities module for Python

https://pypi.org/project/psutil/

High performance Python adapter for PostgreSQL

http://initd.org/psycopg/

Run a subprocess in a pseudo terminal

https://github.com/pexpect/ptyprocess

Library with cross-python path, ini-parsing, io, code, log facilities

https://pylib.org/

Python 3 DNS library

https://pypi.org/project/py3dns/

ASN.1 toolkit for Python

http://snmplabs.com/pyasn1/

Collection of ASN.1 data structures for py-pyasn1

https://github.com/etingof/pyasn1-modules

Python interface to c-ares

https://pypi.org/project/pycares/

Library for making charts with Python

https://bitbucket.org/lgs/pycha

Cython wrapper for the C++ translation of Clipper library

https://github.com/greginvm/pyclipper

Python style guide checker

https://pypi.org/project/pycodestyle/

C parser in Python

https://github.com/eliben/pycparser

Python Cryptography Toolkit

https://pycrypto.org

CUPS bindings for Python

https://github.com/zdohnal/pycups

Passive checker of Python programs

https://github.com/PyCQA/pyflakes

Syntax highlighter written in Python

https://pygments.org/

Python extension wrapping IBM's ICU C++ API

https://pypi.org/project/PyICU/

JSON Web Token implementation in Python

https://github.com/jpadilla/pyjwt

Postfix queue control python tool

https://github.com/outini/pymailq

Python binding to the Networking and Cryptography library

https://pypi.org/project/PyNaCl/

Common base Sphinx theme for PyPA projects

https://github.com/pypa/pypa-docs-theme

General parsing module for Python

https://pypi.org/project/pyparsing/

Module to hyphenate text based on Hunspell dictionaries

https://pyphen.org/

Generate and parse RFC 3339 timestamps

https://pypi.org/project/pyRFC3339/

Python module for producing high quality PostScript graphics

http://pyscript.sourceforge.net/

Python SOCKS module

https://github.com/Anorov/PySocks

SPF (Sender Policy Framework) implemented in Python

https://github.com/sdgathman/pyspf

Snowball Stemming Algorithms for Information Retrieval

https://pypi.org/project/PyStemmer/

Simple powerful testing with Python

https://docs.pytest.org/en/latest/

Py.test plugin providing fixtures and markers for asyncio

https://pypi.org/project/pytest-asyncio/

Pytest plugin with mechanisms for caching across test runs

https://bitbucket.org/hpk42/pytest-cache/

Py.test plugin to capture log messages

https://bitbucket.org/memedough/pytest-capturelog/overview

Pytest plugin for measuring coverage

https://github.com/pytest-dev/pytest-cov

pytest plugin to check FLAKE8 requirement

https://pypi.org/project/pytest-flake8/

py.test plugin to check import ordering using isort

https://github.com/moccu/pytest-isort

Thin wrapper around the mock package for easier use with py.test

https://github.com/pytest-dev/pytest-mock/

Test support for pytest runner in setup.py

https://github.com/pytest-dev/pytest-runner

Pytest plugin to abort hanging tests

https://bitbucket.org/pytest-dev/pytest-timeout