Here are the visualizations created during our session at Mozfest
Visualbox is a simplified version of LODSPeaKr, a framework to create Linked Data-based applications.
The easiest way to create new visualizations is using the Component Editor.
You can also use the command line tool (info from the LODSPeaKr wiki):
There are several examples available in the demo site (all of them use data from DBpedia). These examples are also included in this installation, you can look for them in the admin menu.