Let your Python tests travel through time

https://github.com/spulec/freezegun

Python function signatures from PEP362

http://funcsigs.readthedocs.org/

Clean single-source support for Python 3 and 2

https://python-future.org/

Backport of the concurrent.futures package from Python 3.2

https://github.com/agronholm/pythonfutures

GData Python Client Library

https://github.com/google/gdata-python-client

Python bindings to the GNU dbm library (Python 3.10)

Python Extension that Wraps the GMP Library

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

Python bindings for GNOME 2

http://www.pygtk.org/

Python bindings for GObject

Common files for the Python bindings for GObject

Python bindings for gstreamer

http://gstreamer.freedesktop.org/

Set of Python bindings for GTK+

http://www.pygtk.org/

Python bindings for the version 2 of the GtkSourceView library

http://www.gnome.org

Build System That Generates Other Build Systems

https://gyp.gsrc.io/

Classes and setuptools plugin for Mercurial repositories

https://github.com/jaraco/hgtools

Python based HTML parser based on the HTML5 spec

https://github.com/html5lib

Comprehensive HTTP client library

https://github.com/httplib2/httplib2

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

Internationalized Domain Names in Applications (IDNA)

https://github.com/kjd/idna

Python image size library

https://github.com/shibukawa/imagesize_py

Library that versions your Python projects

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

Python 3.3's ipaddress for Python 2.6 and 2.7

https://pypi.org/project/ipaddress/

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/

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/

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

Super-fast templating language in Python

http://www.makotemplates.org/

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/

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/

More routines for operating on iterables, beyond itertools

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

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/