Basic and General Resources
CmdModule - tool for creating command line oriented user interface
VenomPackage - nonspecific functions useful for any project, with extensive docs and unit tests.
Visualization, Graphics and Games Stuff
[http://mayavi.sourceforge.net/ MayaVi] A library and application for scientific visualization based on VTK.
[http://vpython.org VPython] - 3D programming for ordinary mortals
[http://www.alcyone.com/pyos/chess Chess] - a chess adjudicator module
Web, Security and Cryptography
[http://www.freenet.org.nz/python/SSLCrypto/ SSLCrypto] - package for adding encryption to Python programs.
Any good pointers to client-side web prog resources, anybody?
Data compression
[http://www.joachim-bauch.de/projects/python/pylzma/ PyLZMA] - Python bindings for the LZMA compression algorithm.
Documenting
[http://epydoc.sourceforge.net epydoc] - API documentation generator for Python modules
Language Processing and Parsing
[http://www.lemburg.com/files/python/mxTextTools.html mxTextTools] - a fast text manipulation toolkit for Python
[http://simpleparse.sourceforge.net SimpleParse] - a parser generator for mxTextTools v2.0.0
[http://systems.cs.uchicago.edu/ply/ply.html PLY] - the lex and yacc compiler construction tools implemented in plain Python
[http://pages.cpsc.ucalgary.ca/~aycock/spark SPARK] - Scanning, Parsing and Rewriting Kit
[http://nltk.sourceforge.net NLTK] - Natural Language ToolKit
See LanguageParsing for more tools.