Python Routeing Toolkit: PyRT
- Software to enable collecting routing information in a network. [Open Source, GPL]
- http://ipmon.sprint.com/pyrt/

IPy
- A module for handling IPv4 and IPv6 addresses and networks in a fashion similar to Perl's Net::IP and friends.
- http://c0re.23.nu/c0de/IPy/

ftpparsemodule
- Allows you to parse most ftp-servers LIST responses found in the wild using Dan Bernsteins ftpparse package. [Open Source, BSD-like]
- http://c0re.23.nu/c0de/ftpparsemodule/

ftputil
- A high-level interface to the ftplib module with an interface like the modules os and os.path in the standard library. [Open Source, BSD-like]
- http://www.sschwarzer.net/python/python_software.html

PySNMP
- A set of Python packages implementing SNMP entities. [Open source, BSD-like]
- http://pysnmp.sourceforge.net/

PyMETAR
- Downloads the weather report for a given NOAA station ID, decodes it and the provides easy access to all the data found in the report.
- http://www.schwarzvogel.de/software-pymetar.shtml

OSE: Python Modules
- Has several modules; main one is wrapper around functionality provided in OSE C++ class library; the classes for which a Python wrapper is provided: logging system, realtime events system, service agent framework for creating distributed programs, HTTP se
- http://ose.sourceforge.net/browse.php?group=python-manual&entry=modules.htm

Medusa
- An architecture for building long-running, high-performance network servers in Python. [Open Source, Python license]
- http://www.amk.ca/python/code/medusa.html

Python Network Library
- Dissects network packets, as returned from pylibpcap. [Open Source, GPL]
- http://pynetlibs.sourceforge.net/default.html

Twisted
- A framework for networked applications. [Open Source, LGPL]
- http://www.twistedmatrix.com/

Spread Module
- A Python extension module for Spread, an open source group communications package.[Open Source, Python license]
- http://www.python.org/other/spread/

radius.py
- A pure Python RFC2138 compliant RADIUS authentication module. [Open Source, BSD-like]
- http://py-radius.sourceforge.net/

pyX10
- A set of Python modules for the XAL X10 Automation Library. [Open Source, GPL]
- http://pyx10.sourceforge.net/

Python-LDAP
- An LDAP client API for Python. [Public Domain]
- http://python-ldap.sourceforge.net/

Pylibpcap
- A Python module for the libpcap packet capture library. You can use it to write a custom packet sniffer. [Open Source, BSD-like]
- http://sourceforge.net/projects/pylibpcap/

pylibnet
- Interface for the libnet packet assembly system. [Open Source, GPL]
- http://pylibnet.sourceforge.net/

PyDNS
- A module for looking up DNS entries with Python applications. [Open Source, Python license]
- http://pydns.sourceforge.net/

CDDB.py
- Modules to access the CDDB online database of audio CD track titles and information. [Open Source, GPL]
- http://cddb-py.sourceforge.net/

jabber.py
- A Python module for the jabber instant messaging protocol. [Open Source, LGPL]
- http://jabberpy.sourceforge.net/

asynchttp
- An asynchronous HTTP client library. [Open Source, Python license]
- http://asynchttp.sourceforge.net/