Just another security Distribution into the list Node Zero Linux.
As the site says:
"NodeZero is Ubuntu based linux designed as a complete system which can also be used for penetration testing. NodeZero uses Ubuntu repositories so your system will be always up to date. The system setup is basic and it's primarly designed for disk installation and customization as you want."
Node zero is coming with a good set of tools for penetration testing and claims to be 300 applications based on penetration testing.
The UI of the desktop looks great with a very good eye catching theme .
Source : http://www.netinfinity.org/