BlackRay is a high performance relational database, which combines regular database features with search engine like performance. Full transaction support, SQL and version controlled persisted snapshots characterize BlackRay.
KInterbasDB is a Python DB API 2.0 module for the relational databases Firebird and Interbase. KInterbasDB also exposes most of the native client API of the database engine, including two-phase commit, server-side events, and an administrative API.
WebPython is a web-application development toolkit, written in Python. It contains a portable object-relational database layer, a Python-object persistence system and a templating engine, among other stuff.
Deckard is a simple, curses based, database front-end written in python. The idea is to make something like Microsoft Access, using curses screens, and independent of the database engine.