ClearForest SWS Gnosis

ClearForest - Gnosis provides a Firefox add-in that performs entity extraction on any web page: 

ClearForest Gnosis is the cutting edge of real time semantic processing for the web. By evaluating the pages you read – as you read them – Gnosis immediately locates key information such as people, organizations, companies, products and geographies hidden within the text.

ClearForest also provide a web page to test their Semantic Web Services on any document or pasted text.