One can access to the complete OpenGrey corpus through OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting).
OpenGrey's OAI-PMH exposes its metadata in the OAI-DC metadata format (basic Dublin Core).
To harvest OpenGrey's repository, use the base URL: http://www.opengrey.eu/oai/.
On an OpenGrey research results page, one can export the results in the XML OpenSearch format.
On an OpenGrey bibliographic reference page, one can see (and download) the XML version of the reference, by clicking on "XML" link.
The base of this format is qualified Dublin Core, added with some specific fields.
Zotero is a free biblographic manager, and a Firefox add-on.
When you're on an OpenGrey bibliographic reference page, a
Zotero icon in the URL bar shows that you can import it into
your library.
After clicking on the icon, the record's metadata is automatically
integrated into your Zotero library.