Vulnerability scanning tools

1. Nessus(http://tenable.com)
Data gathering, Host identification, Port scan, Plug-in selection, reporting of data.

2. GFI LanGuard(http://www.gfi.com)
Selectively creates custom vulnerability checks, Identifies security vulnerabilities and takes remedial action, Creates different types of scans and vulnerability tests, Helps ensurce third party security applications offer optimum protection, Performs network devices vulnerability checks.

3. SAINT(http://www.saintcorporation.com)
Detects and fixes possible weaknesses in your network's security, Anticipates and prevents common system vulnerabilities, Demonstrates compliance with current government and industry regulations such as PCI DSS, NERC, FISMA, SOX, GLBA, HIPAA, and COPPA, Performs compliance audits with policies defined by FDCC, USGCB, and DISA.

4. Etc
Retina CS : http://go.eeye.com
Core impact Professional : http://www.coresecurity.com
MBSA : http://www.microsoft.com
Shadow security scanner : http://www.safety-lab.com
Nsauditor Network security audito : http://www.nsauditor.com
OpenVAS : http://www.openvas.org
Security manager plus : http://www.manageengine.com
Nexpose : http://www.rapid7.com
QualysGuard : http://www.qualys.com
Security Auditor's Research Assistant(SARA) : http://www-arc.com