Graph Database CMS (Neo4j, etc.)
Graph Databases are a powerful alternative to both traditional SQL and NoSQL databases. They open up new vistas into existing data masses with existing Content Management Systems.
The most realistic and practical solution for working with enterprise level LAMP CMSes like Drupal or Typo3 is to keep the robust SQL based database and index the data to a complementary Graph Database like Neo4j or OrientDB.
In this case, eZ Platform already has most of the infrastructure in place for this. It has a rich semantic data model with a reference implementation of an integrated indexing solution (Solr and Elastic Search). Creating a plugin to index this database and the relations in a graph will enable interesting views when dealing with large amounts of content.