Nucular Archiving System for creating full text indices for fielded data. Python API, web, and command line interfaces. Fast. Very light weight. Concurrent read/writes with no possible locking issues. No server process. Proximity. Facets. Funny name.
Syncato is a Weblog Web Services system built on top of Berkeley DB XML, Webware and Python. It has a number of unique features; XPath access to all content via URLs, XSL-T presentation and extremely flexible database structure.