Python Web Server from FriendFeed

https://www.tornadoweb.org/

Building newsfiles for your project

https://github.com/twisted/towncrier

Virtualenv-based automation of test activities

https://tox.readthedocs.org/

Fast, extensible progress bar for Python

https://github.com/tqdm/tqdm

New features in traceback backported to Python 2

https://pypi.org/project/traceback2/

Configuration system for Python applications

https://github.com/ipython/traitlets

Python 2/3 implementation of tree structure

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

Requests-like API built on top of twisted.web's Agent

https://github.com/twisted/treq

Library for async concurrency and I/O

https://pypi.org/project/trio/

WebSocket library for Trio

https://github.com/python-trio/trio-websocket

Canonical source for classifiers on PyPI

https://github.com/pypa/trove-classifiers

Top quality TLS certs while you wait, for the discerning tester

https://github.com/python-trio/trustme

Python wrapper for ttfautohint

https://github.com/fonttools/ttfautohint-py

Python progress reporting to /dev/tty

https://liw.fi/ttystatus/

Collection of utilities for interacting with PyPI

https://github.com/pypa/twine

Collection of utilities for interacting with PyPI

https://github.com/pypa/twine

Asynchronous networking framework written in Python

https://twistedmatrix.com/

Python API and command-line toolset for Twitter

https://github.com/sixohsix/twitter

Compatibility API between asyncio/Twisted/Trollius

https://github.com/crossbario/txaio

Runtime type checker for Python

https://github.com/agronholm/typeguard

Typer, build great CLIs. Easy to code. Based on Python type hints

https://typer.tiangolo.com/ https://github.com/fastapi/typer

Typing stubs for Jinja2

https://pypi.org/project/types-Jinja2/

Typing stubs for MarkupSafe

https://pypi.org/project/types-MarkupSafe/

Typing stubs for PyYAML

https://pypi.org/project/types-PyYAML/

Typing stubs for docutils

https://github.com/python/typeshed/tree/main/stubs/docutils

Typing stubs for jsonschema

https://pypi.org/project/types-jsonschema/

Typing stubs for psutil

https://github.com/python/typeshed/tree/main/stubs/psutil

Typing stubs for python-dateutil

https://github.com/python/typeshed

Typing stubs for requests

https://pypi.org/project/types-requests/

Typing stubs for setuptools

https://github.com/python/typeshed/tree/main/stubs/setuptools

Typing stubs for toml

https://github.com/python/typeshed/tree/main/stubs/toml

Typing stubs for urllib3

https://pypi.org/project/types-urllib3/

Backported and Experimental Type Hints for Python 3.5+

https://github.com/python/typing/tree/master/typing_extensions

Runtime inspection utilities for typing module

https://github.com/ilevkivskyi/typing_inspect

Filters to enhance web typography

https://github.com/mintchaos/typogrify/

Provider of IANA time zone data

https://github.com/python/tzdata

Portable, lightweight MessagePack (de)serializer

https://github.com/vsergeev/u-msgpack-python

Bridge between UFOs and FontTools

https://github.com/googlei18n/ufo2ft

Low-level Unified Font Object (UFO) reader and writer

http://unifiedfontobject.org/

UFO font processing library

https://github.com/fonttools/ufoLib2

UFO source file linter

https://github.com/source-foundry/ufolint

Script to normalize the XML and other data inside of a UFO

https://github.com/unified-font-object/ufoNormalizer

Read, write and generate UFOs with designspace data

https://github.com/LettError/ufoProcessor

Ultra fast JSON encoder and decoder for Python

https://github.com/esnme/ultrajson

Simple package

https://github.com/Carreau/undefined

Unicodedata backport and updates

https://github.com/mikekap/unicodedata2

ASCII transliterations of Unicode text

https://pypi.org/project/Unidecode/

Python library to parse and interact with unified diff data

https://github.com/matiasb/python-unidiff

New features in unittest backported to Python 2

https://pypi.org/project/unittest2/

Cross-platform uptime library

https://github.com/Cairnarvon/uptime