Oskar Grenholm of the National Library of Sweden has released oreprovider, an open-source Java application that "will let you disseminate digital objects stored in a Fedora repository as OAI-ORE Resource Maps."
In the announcement, he says:
The idea behind it all is that you have a Java web application (oreprovider.war) that, on the fly, will generate Resource Maps serialized as Atom feeds (using OAI4J) for objects in Fedora. All you have to do in Fedora is to add information in RELS-EXT what datastreams belongs to which Resource Map (exactly how to do this can be seen at the projects web page).