Modules

txObject ATK - Contains the following parts: Object Library, IO/Timers, Threads, Inter-Process/Distributed Communication. [Open Source, GPL]
http://txobject.sourceforge.net/

Parallel Python - Provides an open source module to allow parallel execution of code on systems with multiple processors and on clusters. Features list, documentation, download, code samples, and a discussion forum.
http://www.parallelpython.com/

log4p - The Logging Toolkit For Python, modeled after the Java toolkit log4j. [Open Source, IBM Public License]
http://www.red-dove.com/python_logging.html

pytables - A hierarchical database package designed to efficiently manage very large amounts of data. [Open Source, BSD]
http://www.pytables.org/moin

Grouch - Web development related open source software packages developed by MEMS and Nanotechnology Exchange. [Open Source, Python license]
http://www.mems-exchange.org/software/

ExpectPy - An extension for a Python-feel to the Expect library. [Open Source, LGPL]
http://expectpy.sourceforge.net/

mxBase package extensions for Python - The eGenix.com mx Extensions for Python are a collection of professional quality Python software tools which enhance Python's usability in many important areas such as ODBC database connectivity, fast text processing, date/time processing and web site programming.
http://www.egenix.com/products/python/mxBase/

Pexpect - A pure Python module for spawning child applications; controlling them; and responding to expected patterns in their output. It works like Don Libes' Expect. [Open source, Python Software Foundation License]
http://www.noah.org/wiki/Pexpect

config - Module allows implement a hierarchical configuration scheme for Python applications.
http://www.red-dove.com/python_config.html

The Snack Sound Toolkit - Module for basic sound handling (sound card and disk I/O); includes primitives for sound visualization, e.g. waveforms and spectrograms. [Open Source, GPL]
http://www.speech.kth.se/snack/

Sisyphus - A module that simplifies running Python stuff as cron jobs. [Open Source, Python license]
http://www.livinglogic.de/Python/sisyphus/

Orange - A free, component-based, public domain data mining software, which includes a range of preprocessing, modelling and data exploration techniques. [Open Source, GPL]
http://magix.fri.uni-lj.si/orange/

Universal Serial Port Python Library - A multi-platform pure-Python module to access serial ports, which currently works on Linux and Windows. [Open Source, GPL]
http://balder.prohosting.com/ibarona/en/python/uspp/uspp_en.html