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

JSON Matching Expressions

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

JOSE protocol implementation in Python

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

Implementation of JSON Reference for Python

https://pypi.org/project/jsonref/

Kitchen contains a cornucopia of useful code

https://pypi.org/project/kitchen/

Fast and thorough lazy object proxy

https://github.com/ionelmc/python-lazy-object-proxy

libpeas Python support

http://live.gnome.org/libpeas

Python interface for XML parser library for GNOME

http://xmlsoft.org/

New features in linecache backported to Python 2

https://pypi.org/project/linecache2/

Python bindings for low-level FUSE API

https://bitbucket.org/nikratio/python-llfuse

Platform-independent file locking module

https://github.com/smontanaro/pylockfile

Toolkit for logging of library method calls

https://github.com/ppolewicz/logfury

Pythonic binding for the libxml2 and libxslt libraries

https://lxml.de/

Python binding for the LZ4 compression library

https://github.com/python-lz4/python-lz4

Python binding for the LZMA compression library

http://www.joachim-bauch.de/projects/python/pylzma

Convert markdown formatted file with reST markup to reST format

https://github.com/miyakogi/m2r

Python module for determining file type

https://www.darwinsys.com/file/

Wrapper for email standard library

https://github.com/SpamScope/mail-parser

Super-fast templating language in Python

http://www.makotemplates.org/

Implements an RFC-5804 Manage Sieve client

https://bitbucket.org/ericvsmith/managesieve3

Python implementation of Markdown

https://pythonhosted.org/Markdown/

Fast and complete Python implementation of Markdown

http://code.google.com/p/python-markdown2/

Ned's script to check McCabe complexity

https://pypi.org/project/mccabe/

Python interface to Sendmail milter API

https://pythonhosted.org/milter/

Basic functions for handling mime-types in Python

http://code.google.com/p/mimeparse/

Fastest markdown parser in pure Python

https://github.com/lepture/mistune

Rolling backport of unittest.mock for all Pythons

https://mock.readthedocs.org/en/latest/

Python 3 monotonic time module for Python 2

https://github.com/atdt/monotonic

More routines for operating on iterables, beyond itertools

https://github.com/more-itertools/more-itertools

More routines for operating on iterables, beyond itertools

https://github.com/erikrose/more-itertools

Python MPD client library

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

Python Library for Arbitrary-precision Floating-point Arithmetic

http://www.mpmath.org/

MessagePack (de)serializer for Python

https://msgpack.org/

Multidict implementation

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

Python-based audio metadata tag reader and writer

https://github.com/quodlibet/mutagen

Tool for migrating/converting from MySQL to PostgreSQL

http://packages.python.org/py-mysql2pgsql/

Discovery-based unittest extension

https://nose.readthedocs.io/

Python bindings for libnotify

http://www.galago-project.org/specs/notification/index.php

The Numeric Extension to Python

http://numeric.scipy.org/

Python library for OAuth version 1.0

https://github.com/joestump/python-oauth2

Python interface to the OpenSSL library

https://github.com/pyca/pyopenssl

Python bindings for ORBit2

Python SSH2 protocol library

https://www.paramiko.org/

Python module for parsing 'human readable' date/time expressions

https://github.com/bear/parsedatetime

General parsing module for Python

https://pypi.python.org/pypi/pyparsing

Python Build Reasonableness

https://github.com/openstack-dev/pbr

Pure-Python PDF toolkit

http://pybrary.net/pyPdf/

Pure-Python PDF toolkit

https://mstamy2.github.io/PyPDF2/