OpenCalais is the Open Source repository for the Calais project.
"Calais: Connect. Everything." 
We want to make all the world's content more accessible, interoperable and valuable. Some call it Web 2.0, Web 3.0, the Semantic Web or the Giant Global Graph - we call our piece of it Calais.
Calais is a rapidly growing toolkit of capabilities that allow you to readily incorporate state-of-the-art semantic functionality within your blog, content management system, website or application.
- Is OpenCalais Becoming a Search Engine?: http://blog.semantic-web.at/2008/03/31/is-opencalais-becoming-a-search-engine/
- OpenCalais Home: http://opencalais.com