ZODB - The Z Object Database, or the ZODB for short, is a powerful and easy-to-use object persistence system for Python. [Open Source, ZPL] - http://wiki.zope.org/ZODB/FrontPage
Another Python SQLite Wrapper - APSW is a thin wrapper over the SQLite 3 API. [Open Source, zlib/libpng license] - http://initd.org/tracker/pysqlite/wiki/APSW
DMtools - A data mining toolbox with caching of database queries and parallelism within a collection of independent queries. [Open Source, GPL] - http://datamining.anu.edu.au/software/dmtools/
PyDO2 - An ORM (Object-Relational Mapper) database access library for Python. [Open Source, GPL] - http://skunkweb.sourceforge.net/pydo2.html
SQLObject - A Object Relational Manager for providing an object interface to your database, with tables as classes, rows as instances, and columns as attributes. [Open Source, LGPL] - http://www.sqlobject.org/
SQLAlchemy - SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL. [Open Source, MIT license] - http://www.sqlalchemy.org/
SnakeDb - An easy database API that is a wrapper around other Python database modules (like Gadfly and MySQLdb). [Open source, GPL] - http://sourceforge.net/projects/snakedb/
Metakit for Python (Mk4py) - A lower-level API for the Metakit C++ core extension, and uses SCXX by Gordon McMillan as C++ glue interface. [X/MIT-style and commercial licenses] - http://www.equi4.com/metakit.html
ZODB-Tutorial.py - A number of hands-on code example how to use the ZODB. - http://www.h7.dion.ne.jp/~harm/ZODB-Tutorial.py
pSQL - A wrapper above MySQLdb which renders MySQL databases as very comfortable pythonic objects. - http://software.fionet.com/pSQL/
PDO - Python Database Objects provides a convenient Object Oriented API for database access in Python. PDO supports multiple RDBMS with the same API, and provides features not found in the DB-API spec, such as column access by name. [OPen source, BSD style lic - http://pdo.neurokode.com/
Python SQL Database Access System - A simple and consistent programming interface to SQL databases, in Python. [Open source, Python Software Foundation License] - http://sourceforge.net/projects/pysqldb/
Python Database Row Module - This Python 2.2 module defines light-weight objects which allow very flexible access to a fixed number of positional and named attributes via several interfaces. [Open Source, BSD-like] - http://opensource.theopalgroup.com/
SQLDict Module - A dictionary-style interface around any DB API-compatible database. [Open Source, BSD-like] - http://dustman.net/andy/python/SQLDict
MetaKit for Python - A Python interface to MetaKit. MetaKit is an embeddable database which runs on Unix, Windows, Macintosh, and other platforms. [Open-Source, MIT] - http://www.equi4.com/metakit/python.html