Piggy-Bank "The Piggy-Bank extension is designed to let users of the Mozilla Firefox browser collect and browse "semantic data" linked from ordinary web pages. Semantic data is data described using the Semantic Web project's Resource Description Framework (RDF)."
Similar to Annozilla but it comes with its own server - neat use of Firefox extensions.
"Piggy-Bank uses the HSQLDB databases, indexed using the Lucene library. Piggy-Bank insternally runs a Jetty web server to serves content retrieved from the databases, dynamically formatted using the Velocity web templating engine."
OS X users will have to use the Java Plugin to enable Java 1.4 in Firefox. But why use Firefox, it can't use ActiveX (it's 1997 all over again).