Database of records is not publicly accessible or searchable, but API info suggests it might be accessible to developers through the API http://www.zotero.org/support/dev/start.
Linked open data. More languages to comes. "Downloading is authorized without any prior written permission from the copyright holders provided the source is fully acknowledged. Reproduction of any material related to AGROVOC for resale or any other commercial purposes whatsoever is prohibited without the written permission of the copyright holders." Includes geographic place names.
Used for indexing the records contained in GLIN.