WP Customer Reviews allows your customers and visitors to leave reviews or testimonials of your services. Reviews are Microformat enabled (hReview).
Automate Google Structured data for your wordpress built specially for SEO and social perspective.
A RDFa breadcrumbs generator, specifically made for SEO purposes, that works in every scenario and displays the correct rich snippets in Google.
An easy template tag for showing a breadcrumb menu on your site and on google search results with built in RDFa Markup.
Adds GoodRelations metadata as RDFa to WP e-Commerce plugin
Allows tagging of media as having a Creative Commons license. License info shows as link and/or image and is searchable. Search engine optimized.
wp-RDFa brings the semantic Web to WordPress