I'm pleased to announced the next release of Demokritos.
Demokritos is a Python library and content repository implementing the Atom Syndication Format (RFC4287) and Atom Publishing Protocol (currently a standards track Internet-Draft)
You can download the code at http://jtauber.com/2006/demokritos/demokritos-0.3.0.tgz
This release add persistence using a Subversion backend and has been updated for draft-ietf-atompub-protocol-08
Note that you'll need Subversion 1.3 with the SWIG Python bindings built.
At this stage, Demokritos is not really intended for anything other than interoperability testing with Atom clients. However, the library for parsing and generating Atom feeds might be useful standalone as may the web and svn modules.
Demokritos is made available under a GPL license.
UPDATE: Now see Demokritos 0.3.5 Released