Tools

http://sectools.org/tool/snort/

http://www.sans.org/critical-security-controls/control/1

https://www.alienvault.com/landing/nmap

Hacker target. Com

http://tonyonsecurity.com/2013/03/13/ossec-for-website-security-part-i/

http://firecat.toolswatch.org/the_catalog.html

http://www.spiderfoot.net/

Download

ESET IDS: http://en.kioskea.net/faq/29942-eset-configure-the-hips-intrusion-prevention-system

Qualys: https://www.qualys.com/forms/freescan/

ISECOM – Open Source Security Testing Methodology Manual (OSSTMM): http://www.isecom.org/research/osstmm.html