Semantic Interaction Framework
With VIE you can easily interact with RDFa-annotated content on your pages, as well as connect with various semantic services like Apache Stanbol and DBpedia.
All entities you deal with are managed in a centralized collection, and VIE provides ways to deal with namespaces, relations between entities, and if needed, your content type system.
VIE is used as the basis for a wide variety of tools ranging from content annotators to full front-end editing interfaces and semantic browser extensions. You can find many of these from the Widgets section of this site.