SpiderFoot: Free open-source footprinting tool

"Footprinting" is the process of understanding as much as possible about a given target in order to perform a more complete security penetration test. Particularly for large networks, this can be a daunting task.

  

The main objective of SpiderFoot is to automate this process to the greatest extent possible, freeing up a penetration tester's time to focus their efforts on the security testing itself.

 

SpiderFoot is a free, open-source footprinting tool, enabling you to perform various scans against a given domain name in order to obtain information such as sub-domains, e-mail addresses, owned netblocks, web server versions and so on. The main objective of SpiderFoot is to automate the footprinting process to the greatest extent possible, freeing up a penetration tester's time to focus their efforts on the security testing itself.

Grab it from: http://www.spiderfoot.net/

New in this release, which is actually a complete re-write of the version from 2005(!): - Now runs on Windows as well as Linux, Solaris, *BSD (basically anything with Python should be fine)

• Scans are even more configurable than before
• All scan data stored locally in an SQLite database for querying, reporting and analysis - Many more scans/tests included (GeoIP, URL linkage, web technology, port scans...) - You can now easily extend functionality by writing your own modules in Python 
• Completely new user interface, which is now entirely web-based
• Configuration state is stored between runs
• Scanning can be remotely controlled

I hope you find it useful, and if you have any suggestions/complaints, feel free to contact me.