Fastest Python implementation of JSON schema

https://horejsek.github.io/python-fastjsonschema/

Universal feed parser written in Python

https://github.com/kurtmckee/feedparser

Flexible Isometric Free Engine

http://www.fifengine.net/

Platform independent file lock

https://github.com/benediktschmitt/py-filelock

Finds the libpython associated with your environment

https://github.com/ktbarrett/find_libpython

Fixtures, reusable state for writing clean tests and more

https://pypi.org/project/fixtures/

Code checking using pep8 and pyflakes

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

Plugin for nose or pytest that automatically reruns flaky tests

https://github.com/box/flaky

Micro web framework

http://flask.pocoo.org/

Flask extension adding a decorator for CORS support

https://github.com/corydolphin/flask-cors

JWT token authentication for Flask apps

https://github.com/mattupstate/flask-jwt

Simple framework for creating REST APIs with Flask

https://flask-restful.readthedocs.io/

Add SQLAlchemy support to your Flask application

https://flask-sqlalchemy.palletsprojects.com/en/3.1.x/ https://github.com/pallets-eco/flask-sqlalchemy

FlatBuffers serialization format for Python

https://google.github.io/flatbuffers/

Simple packaging tool for simple packages

https://flit.pypa.io/en/stable/ https://github.com/pypa/flit

Distribution-building parts of Flit

https://flit.pypa.io/en/stable/ https://github.com/pypa/flit/tree/main/flit_core

PEP 518 build backend that uses setuptools_scm to generate a version file

https://gitlab.com/WillDaSilva/flit_scm

API for detecting the original bouncing email addresses from a bounce message

https://fluflbounce.readthedocs.io

High-level API for Python internationalization

https://flufli18n.readthedocs.io

NFS-safe file locking with timeouts for POSIX systems

https://flufllock.readthedocs.io

Random assortment of WSGI servers

https://bitbucket.org/denisenkom/flup

Font version reporting and modification tool

https://github.com/source-foundry/font-v

Set of objects for performing math operations on font data

https://github.com/typesupply/fontMath

Font analysis tool for determining character/glyph support

https://github.com/googlefonts/pyfontaine

Python library for manipulating OpenType font features

https://github.com/simoncozens/fontFeatures

Compile fonts from sources to binary

https://github.com/googlei18n/fontmake

API for interacting with the parts of fonts during the font development process

https://github.com/robotools/fontParts

Collection of classes implementing the pen protocol for manipulating glyphs

https://github.com/robotools/fontPens

Open source library for manipulating fonts, written in Python

https://github.com/fonttools/fonttools

Open source library for manipulating fonts, written in Python

https://github.com/fonttools/fonttools

HTML form validation, generation, and conversion package

https://www.formencode.org/

Simple PDF generation for Python

https://code.google.com/p/pyfpdf/

Freetype python bindings

https://github.com/rougier/freetype-py

Let your Python tests travel through time

https://github.com/spulec/freezegun

List-like structure which implements collections.abc.MutableSequence

https://github.com/aio-libs/frozenlist

Python filesystem abstraction

http://pyfilesystem.org/

Python Filesystem abstraction layer, version 2.x

https://www.pyfilesystem.org/

File-system specification

https://filesystem-spec.readthedocs.io/en/latest/ https://github.com/fsspec/filesystem_spec

XRootD implementation for fsspec

https://coffeateam.github.io/fsspec-xrootd/ https://github.com/CoffeaTeam/fsspec-xrootd

High-level FTP client library

https://ftputil.sschwarzer.net/

Mail scanning daemon for Postfix written in Python

https://fuglu.org/

Python function signatures from PEP362

http://funcsigs.readthedocs.org/

Clean customizable Sphinx documentation theme

https://pradyunsg.me/furo/ https://github.com/pradyunsg/furo

Simple ctypes bindings for FUSE

https://github.com/fusepy/fusepy

Clean single-source support for Python 3 and 2

https://python-future.org/

HPE firmware pack utility

https://github.com/HewlettPackard/fwget

Module designed to write games in Python

https://www.pygame.org/news

AST that abstracts the underlying Python version

https://github.com/serge-sans-paille/gast

Python binding for GDAL

https://gdal.org/ https://github.com/OSGeo/gdal

Python bindings to the GNU dbm library (Python 3.11)