Maltego

Maltego is an open source intelligence (OSINT) and graphical link analysis tool for gathering and connecting information for investigative tasks. With Maltego, you can easily mine data from dispersed sources, automatically merge matching information in one graph, and visually map it to explore your data landscape.

Security professionals and forensic investigators around the world use Maltego as an integral tool in their cases. The software is also remarkably beneficial to researchers and investigative journalists.