SpiderFoot can be used offensively, i.e. as part of a black-box penetration test to gather information about the target or defensively to identify what information your organisation is freely providing for attackers to use against you.
Install
To install Spiderfoot on Ubuntu 14.04.3 LTS Desktop :
sudo apt-get install git python-dev python-pip python-m2crypto python-netaddr python-pypdf python-stem python-lxml
sudo pip install cherrypy mako
cd ~
mkdir arsenal
cd arsenal
git clone https://github.com/smicallef/spiderfoot.git
cd spiderfoot
python sf.py
Then, use your Firefox to browse
http://127.0.0.1:5001/
Update/Upgrade
sudo apt-get update
sudo apt-get dist-upgrade
sudo pip install cherrypy mako--upgrade
cd ~/arsenal/spiderfoot
git pull origin master
Reference
Documentation
That's all! See you.