The AGROVOC multilingual thesaurus is a collaborative project under the auspices of the Food and Agriculture Organization (FAO) of the United Nations.

From the website:

AGROVOC is a controlled vocabulary covering all areas of interest of the Food and Agriculture Organization of the United Nations, including food, nutrition, agriculture, fisheries, forestry, environment etc. It is published by FAO and edited by a community of experts. It is widely used in specialized libraries as well as digital libraries and repositories to index content and for the purpose of text mining. It is also used as a specialized tagging resource for content organization by FAO and third-party stakeholders.

AGROVOC consists of +37,000 concepts and +750,000 terms in up to 37 languages. Currently, AGROVOC is an SKOS-XL concept scheme, and a Linked Open Data (LOD) set edited.