Apache Solr RDF Support
This is a project specifically created for the Google Summer of Code 2009 project Adding RDF Support to the ApacheSolr module (q.v. for more informations; maybe also interesting: this discussion which first introduced the idea).
Its purpose is to allow the Apache Solr Search Integration module to handle arbitrary RDF data.
The project isn't maintained anymore, since I lack both the necessary time and belief in the module's usefulness. Anyone disagreeing on the latter part may take over the project, if they want.