Maltego is an open source intelligence and forensics application. It will offer you timous mining and gathering of information as well as the representation of this information in a easy to understand format.
Maltego can be used for the information gathering phase of all security related work. It will save you time and will allow you to work more accurately and smarter.
Maltego aids you in your thinking process by visually demonstrating interconnected links between searched items.
Maltego provide you with a much more powerful search, giving you smarter results.
If access to "hidden" information determines your success, Maltego can help you discover it.
Download and more info: http://www.paterva.com