This plugin publishes your weblog as RDF in both XML and JSON. Mapping WordPress objects to the major ontologies.
Micro Anywhere allows for easy insertion of microformatted contact information and event details through the wordpress WYSIWYG editor.
Easy Contact is a simple, highly extensible XHTML contact form featuring spam-reduction measures, GUI customization, and shortcode-based insertion.
This plugin allows you to change the DIV/Container element of each widget to one of the new HTML5 Semantic tags.
Super Contact Form Plugin.
Semantic Web plugin which adds XML Topic Maps (XTM) feed support to WordPress blogs.