Transmogrify.blogger is a project mainly written in Python, it's free.
A transmogrifier source for Blogger Atom exports
This package provides a transmogrifier <http://pypi.python.org/pypi/collective.transmogrifier>
source for
blogs that come from Blogger <http://blogger.com>
. The package parses
the Atom xml export from Blogger and places the blog posts and comments
into the transmogrifier pipeline. The settings from the blog can also be
accessed through transmogrifier annotations.