WSGI HTTP Server for UNIX

https://gunicorn.org/

Build System That Generates Other Build Systems

https://gyp.gsrc.io/

Pure-Python, bring-your-own-I/O implementation of HTTP/1.1

https://pypi.org/project/h11/

HTTP/2 State-Machine based protocol implementation

http://hyper.rtfd.org/

Fancy PyPI READMEs with Hatch

https://github.com/hynek/hatch-fancy-pypi-readme

Hatch plugin for versioning with your preferred VCS

https://github.com/ofek/hatch-vcs

Modern, extensible Python build backend

https://github.com/pypa/hatch/tree/master/backend

Print binary in hex format

https://pypi.org/project/hexdump/

Classes and setuptools plugin for Mercurial repositories

https://github.com/jaraco/hgtools

Python extension that wraps hiredis

https://github.com/pietern/hiredis-py

HTTP/2 header encoding (HPACK) logic implementation

http://hyper.rtfd.org/

Chromium HSTS Preload list

https://github.com/sethmlarson/hstspreload

Python based HTML parser based on the HTML5 spec

https://github.com/html5lib

HTTP Request & Response Service

https://github.com/postmanlabs/httpbin

Minimal low-level HTTP client

https://github.com/encode/httpcore

Comprehensive HTTP client library

https://github.com/httplib2/httplib2

Next generation HTTP client

https://www.python-httpx.org/ https://github.com/encode/httpx

Next generation HTTP client

https://github.com/encode/httpx

Python module that decodes binary streams into HTTP/2 frames

http://hyper.rtfd.org/

Featureful, correct URL for Python

https://github.com/python-hyper/hyperlink

Library for property based testing

https://github.com/HypothesisWorks/hypothesis/tree/master/hypothesis-python

File identification library for Python

https://github.com/pre-commit/identify

Internationalized Domain Names in Applications (IDNA)

https://github.com/kjd/idna

Patch ssl.match_hostname for Unicode(idna) domains support

https://pypi.org/project/idna_ssl/

Python image size library

https://github.com/shibukawa/imagesize_py

Read metadata from Python packages

https://github.com/python/importlib_metadata

Read resources from Python packages

https://github.com/python/importlib_resources

Library that versions your Python projects

https://pypi.org/project/incremental/

Simple parsing of ini files in Python

https://pypi.org/project/iniconfig/

Library for installing Python wheels

https://github.com/pypa/installer

Regex intersection checker

https://github.com/MegaIng/interegular

Editable interval tree data structure for Python 2 and 3

https://github.com/chaimleib/intervaltree

Python task execution tool & library

https://github.com/pyinvoke/invoke

Google open source IPv4/IPv6 manipulation library in Python

https://github.com/google/ipaddr-py

Simple module to parse ISO 8601 dates

https://bitbucket.org/micktwomey/pyiso8601

ISO 8601 date/time/duration parser and formater

https://pypi.org/project/isodate/

Python import sorter utility

https://github.com/PyCQA/isort

Various helpers to pass data in untrusted environments

https://github.com/mitsuhiko/itsdangerous/

Shared namespace shim for py-jaraco.* ports

Python class routines

https://github.com/jaraco/jaraco.classes

Context managers by jaraco

https://github.com/jaraco/jaraco.context

Additional functools for Python

https://github.com/jaraco/jaraco.functools

Autocompletion tool for Python

https://github.com/davidhalter/jedi

Low-level, pure Python DBus protocol wrapper

https://gitlab.com/takluyver/jeepney

JSON Matching Expressions

https://github.com/jmespath/jmespath.py

JOSE protocol implementation in Python

https://josepy.readthedocs.io/en/latest/

Ultimate Python library for JOSE RFCs

https://jose.authlib.org/en/dev/ https://github.com/authlib/joserfc

Diff JSON and JSON-like structures in Python

https://github.com/xlwings/jsondiff

Form validation for JSON-like data

https://github.com/RussellLuo/jsonform

Apply JSON-Patches (RFC 6902)

https://github.com/stefankoegl/python-json-patch