Netglub!

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. Coupled with its graphing libraries, Maltego allows you to identify key relationships between information and identify previously unknown relationships between them.

poortego - Open-source ruby project to handle the storage and linking of open-source intelligence (ala Maltego, but free as in beer and not tied to a specific / proprietary datbase)