Cryptography
Advanced Encryption Suite, auth-modules, CryptKit, ezPyCrypto, M2Crypto, mxCrypto, Pisces, pyOpenSSL, Python Cryptography Toolkit, Python mcrypt wrapper
Databases and Persistence
ADODBAPI, cx_Oracle, DCOracle, DCOracle2, DMtools, GV Interbase Database Adapter, Ingres interface, kinterbasdb, MetaKit for Python, Metakit for Python (Mk4py)
Directories
Python software at freshmeat.net, SourceForge's Python Foundry, Vaults of Parnassus, Web Modules Overview
Distributed Computing
Fast Python Xmlrpc Library, Fnorb, omniORBpy, ORBit-Python, OSE, PyORBit, PYRO - Python Remote Objects, Python Web Services, SOAP for Python, XML-RPC for Python
Graphics
Biggles, gdmodule, Gnuplot.py, gracePlot.py, JpGraph, Lightflow Rendering Interface, Ming, PyChart, pyGDChart, PyInventor
GUI
anygui, FXPy, glc, Pmw, PyGTK, PyKDE, PyQt, Python X Library, PythonCard, SpecTix GUI Builder
Math and Calculations
Cost Accounting Module, Early Math, FixedPoint.py, fourier.py, Fraction.py, Functions for complex numbers, Gary Strangman's Python Modules, GMPY, Mathter, MatPy - Matrix package for Python
Network
asynchttp, CDDB.py, dictclient, ftpparsemodule, ftputil, Googlesh, GrokItBot, IPy, jabber.py, Medusa
Text Processing
CSV importer/exporter, CSV module for Python, D Parser for Python, EmPy, mxTextTools, pyMifluz, pyparsing, PyStemmer, ServPDF, SimpleParse
WWW
A list of open-source HTTP proxies written in Pyth, Albatross, Aquarium Website Framework, ASPN Python Modules, ASPy - Active Server Python, ASV for Python, Castalian, CDDB audio CD track info access, CGI Link Checker, CherryPy
XML
Parsers, 4Suite XML Tools, jaxml, maki, PIRXX, Pyana, PySablot, Python/XML Libraries, PyTREX, pyxhtml, Redfoot
config
Module allows implement a hierarchical configuration scheme for Python applications.
davlib.py
Provides client-side access to a DAV server. DAV is a protocol for remote web-site authoring and management. [Open Source, Python license]
ExpectPy
An extension for a Python-feel to the Expect library. [Open Source, LGPL]
Grouch
A system for describing and enforcing a Python object schema. [Open Source, Python license]
ID3.py
A simple Python module for retrieving and setting ID3 tags on MP3 compressed audio files through an object-oriented interface. [Open Source, GPL]
Java-Python Extension
A seamless, complete, and efficient integration of Java and standard Python (C Python). JPE provides Java access to Python's native extension, and Java's Swing to Python developers. [Open Source, MPL]
log4p
The Logging Toolkit For Python, modeled after the Java toolkit log4j. [Open Source, IBM Public License]
Maurer, Dieter - Python Projects
where.py - returns information about the sequence of calls leading to the calling function in the form of a sequence of tuples (function,file,lineno), PyAudioCD for Linux, TreeWidget, PyXPath, WeakDicts - addressing CPython's problems with cyclic references, addContentTable to HTML documents, XSL-Pattern modules.
mxDateTime
Date and Time types for Python. [Open Source]
Orange
A free, component-based, public domain data mining software, which includes a range of preprocessing, modelling and data exploration techniques. [Open Source, GPL]
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]
pygame
A set of Python extension modules designed for writing games. The core of pygame is wrapped on top of the SDL library. [Open Source, LGPL]
PyObjC
Allows developer to transparently message objective-c objects from Python.
pyrepl
A replacement for readline for use from Python with better multi-line editing. [Open Source, Python-style]
pytables
A hierarchical database package designed to efficiently manage very large amounts of data. [Open Source, BSD]
Python Chess Module
A Python module which understands the rules of chess and can adjudicate a game, verifying if moves are correct. [Open Source, GPL]
PyUnit
A standard, proven, simple and elegant framework for writing unit tests for Python software. [Open Source, Python license]
Sisyphus
A module that simplifies running Python stuff as cron jobs. [Open Source, Python license]
tarfile
A pure Python module for reading and writing .tar and tar.gz files. [Open Source, BSD-like]
The Dabo Framework
A 3-tier, cross-platform application development framework, written in Python atop the wxPython GUI toolkit. [Open source, MIT license]
The ReportLab Toolkit
A PDF generation library. [Open source, BSD-like]
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]
txObject ATK
Contains the following parts: Object Library, IO/Timers, Threads, Inter-Process/Distributed Communication. [Open Source, GPL]
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]
WConio (Windows CONsole I/O)
TurboC conio.h style console support for Python under Win32. [Public Domain]
Win32all
Extension modules for Windows 9x/NT/2K that include COM support, WinAPI calls, ODBC and the PythonWin IDE.
Xoltar Toolkit
Utility modules, including functional programming support, lazy expressions and data structures, and thread pools. [Open Source, LGPL]