Buildbot Grid View plugin

https://buildbot.net

Buildbot packaging tools

https://buildbot.net

Buildbot Waterfall View plugin

https://buildbot.net

Buildbot Worker Daemon

https://buildbot.net

Buildbot UI

https://buildbot.net

Read and write bzip2-compressed files

https://github.com/nvawda/bz2file

Extensible memoizing collections and decorators

https://github.com/tkem/cachetools

Python 2 bindings for Cairo

https://github.com/pygobject/pycairo

CFFI-based Cairo bindings for Python

https://github.com/SimonSapin/cairocffi

Simple SVG Converter based on Cairo

https://www.courtbouillon.org/cairosvg

Python client library for Apache Cassandra

https://github.com/datastax/python-driver

Draw pretty animated colored circles in the terminal

https://github.com/tartley/cbeams

RFC 7049 - Concise Binary Object Representation

https://pypi.org/project/cbor/

Pure Python CBOR (de)serializer with extensive tag support

https://pypi.org/project/cbor2/

Let's Encrypt client

https://github.com/certbot/certbot

Apache plugin for Certbot

https://github.com/certbot/certbot

Google Cloud DNS Authenticator plugin for Certbot

https://github.com/certbot/certbot

OVH DNS Authenticator plugin for Certbot

https://github.com/certbot/certbot

Route53 DNS Authenticator plugin for Certbot

https://github.com/certbot/certbot

NGINX plugin for Certbot

https://github.com/certbot/certbot

Mozilla SSL certificates

https://github.com/certifi/python-certifi

Foreign Function Interface for Python calling C code

http://cffi.readthedocs.org/

Python attributes without boilerplate

https://github.com/hynek/characteristic

Universal encoding detector for Python

https://github.com/chardet/chardet/

HTML template engine for Python

https://cheetahtemplate.org/

Highly-optimized, pure-python HTTP server

https://github.com/cherrypy/cheroot

Python framework for command line utilities

https://liw.fi/cliapp/

Python package for creating command line interfaces

https://github.com/mitsuhiko/click

Black box testing of Unix programs

https://liw.fi/cmdtest/

Cross-platform API to print colored terminal text from Python apps

https://github.com/tartley/colorama

Command line argument to object parsing library

https://github.com/chrissimpkins/commandlines

CFF subroutinizer for fontTools

https://github.com/googlei18n/compreffor

Drop-in replacement for argparse

https://pypi.org/project/ConfigArgParse/

Simple but powerful config file reader and writer

https://github.com/DiffSK/configobj/

INI style configuration file parser

https://pypi.org/project/configparser/

Provides symbolic constant support to Python projects

https://pypi.org/project/constantly/

Backports and enhancements for the contextlib module

https://pypi.org/project/contextlib2/

Python API for ISO country, subdivision, language and currency

https://pypi.org/project/pycountry/

Code coverage measurement for Python

https://coverage.readthedocs.io/

Cryptographic recipes and primitives for Python developers

https://github.com/pyca/cryptography

Test vectors for the cryptography package

https://github.com/pyca/cryptography/tree/main/vectors

Cssselect parses CSS3 Selectors and translates them to XPath 1.0

https://github.com/scrapy/cssselect

CSS selectors for Python ElementTree

https://github.com/Kozea/cssselect2

CSS Cascading Style Sheets library for Python

https://github.com/jaraco/cssutils

Cubic-to-quadratic bezier curve conversion

https://github.com/googlei18n/cu2qu

Coroutine-based library for concurrent Python systems programming

https://github.com/dabeaz/curio

Composable style cycles

https://github.com/matplotlib/cycler/

Well-behaved daemon framework for Python

https://pypi.org/project/python-daemon/

Datadog Python library

https://github.com/DataDog/datadogpy

Extensions to the standard Python datetime module

https://dateutil.readthedocs.io