Alfresco Visualization Tools (AVT) provides a platform to bring content visualization to Alfresco. It also includes dashlets to view and visualize content within Alfresco repositories using D3.js and Simile Project. Following visualizations are provided along with this project.
Alfresco Activity Feed Timeline
Alfresco Site Animated Circle Packing (SiteView) Visualization
Alfresco Site Active Content Visualization
More visualizations are coming. You can also contribute your visualizations.