PoolParty plugin makes websites more understandable. Blogs benefit from linking posts with key terms automatically. The plugin uses SKOS vocabularies

This plugin imports a SKOS thesaurus, highlights terms and generates links automatically for any terms available in the thesaurus.

This plugin publishes your weblog as RDF in multiple formats (xml, turtle, json etc). Mapping WordPress objects to the major ontologies.

This plugin allows allows the creation and publishing of triple relationships in RDF format.

LH Tools is a wordpress plugin that enables a sparql endpoint for for WordPress sites. This will enable semantic querying of WordPress data.