kali linux - http://www.kali.org/
ubuntu - http://www.ubuntu.com/download
blackbuntu - http://www.pen-tests.com/blackbuntu-download.html
backtrack 5R1- http://www.pen-tests.com/backtrack-5-r1-download.html
NIST Guideline in Network Security Testing - http://www.pen-tests.com/nist-guideline-in-network-security-testing.html
semoga membantu.
