I offer security consulting services within the space of Penetration Testing , Ethical Hacking , Vulnerability Assessments and Security Code and Configuration Reviews

Top Vulnerability Scanners

Nessus Scanner
Operating Systems: Windows, Mac OS X, OpenBSD, FreeBSD, Solaris, and/or other UNIX variants
Nessus was a popular free and open source vulnerability scanner until they closed the source code in 2005 and removed the free “registered feed” version in 2008. A limited “Home Feed” is still available, though it is only licensed for home network use. Some people avoid paying by violating the “Home Feed” license, or by avoiding feeds entirely and using just the plugins included with each release. But for most users, the cost has increased from free to $1200/year. Despite this, Nessus is still the best UNIX vulnerability scanner available and among the best to run on Windows. Nessus is constantly updated, with more than 20,000 plugins. Key features include remote and local (authenticated) security checks, a client/server architecture with a GTK graphical interface, and an embedded scripting language for writing your own plugins or understanding the existing ones.
Premier UNIX vulnerability assessment tool
GFI LANguard
Operating Systems: Windows
GFI LANguard scans IP networks to detect what machines are running. Then it tries to discern the host OS and what applications are running. I also tries to collect Windows machine’s service pack level, missing security patches, wireless access points, USB devices, open shares, open ports, services/applications active on the computer, key registry entries, weak passwords, users and groups, and more. Scan results are saved to an HTML report, which can be customized/queried. It also includes a patch manager which detects and installs missing patches. A free trial version is available, though it only works for up to 30 days.
A commercial network security scanner for Windows
Retina CS
Operating Systems: Windows
Like Nessus, Retina’s function is to scan all the hosts on a network and report on any vulnerabilities found. It was written by eEye, who are well known for their security research.
Commercial vulnerability assessment scanner by eEye
Core Impact
Operating Systems: Windows
Core Impact isn’t cheap (be prepared to spend tens of thousands of dollars), but it is widely considered to be the most powerful exploitation tool available. It sports a large, regularly updated database of professional exploits, and can do neat tricks like exploiting one machine and then establishing an encrypted tunnel through that machine to reach and exploit other boxes. If you can’t afford Impact, take a look at the cheaper Canvas or the excellent and free Metasploit Framework. Your best bet is to use all three.
An automated, comprehensive penetration testing product
ISS Security Scanner
Operating Systems: Windows
Internet Scanner started off in ’92 as a tiny open source scanner by Christopher Klaus. Now he has grown ISS into a billion-dollar company with a myriad of security products.
Application-level vulnerability assessment
X-scan Vulnerability Scanner
Operating Systems: Windows
A multi-threaded, plug-in-supported vulnerability scanner. X-Scan includes many features, including full NASL support, detecting service types, remote OS type/version detection, weak user/password pairs, and more. You may be able to find newer versions available here if you can deal with most of the page being written in Chinese.
A general scanner for scanning network vulnerabilities
SARA Vulnerability Scanner
Operating Systems: Windows, Mac OS X, OpenBSD, FreeBSD, Solaris, and/or other UNIX variants
SARA is a vulnerability assessment tool derived from the infamous (at least in 1995) SATAN scanner. They ceased development after releasing version 7.9.1 in June 2009.
Security Auditor’s Research Assistant

Delivered as a service over the Web, QualysGuard eliminates the burden of deploying, maintaining, and updating vulnerability management software or implementing ad-hoc security applications. Clients securely access QualysGuard through an easy-to-use Web interface. QualysGuard features 5,000+ unique vulnerability checks, an Inference-based scanning engine, and automated daily updates to the QualysGuard vulnerability KnowledgeBase.
A web-based vulnerability scanner
SAINT Vulnerability Scanner
Operating Systems: Linux, Mac OS X, OpenBSD, FreeBSD, Solaris, and/or other UNIX variants
SAINT is another commercial vulnerability assessment tool (like Nessus, ISS Internet Scanner, or Retina). It runs on UNIX and used to be free and open source, but is now a commercial product.
Security Administrator’s Integrated Network Tool
Operating Systems: Windows
Microsoft Baseline Security Analyzer (MBSA) is an easy-to-use tool designed for the IT professional that helps small and medium-sized businesses determine their security state in accordance with Microsoft security recommendations and offers specific remediation guidance. Built on the Windows Update Agent and Microsoft Update infrastructure, MBSA ensures consistency with other Microsoft management products including Microsoft Update (MU), Windows Server Update Services (WSUS), Systems Management Server (SMS) and Microsoft Operations Manager (MOM). Apparently MBSA on average scans over 3 million computers each week.
Microsoft Baseline Security Analyzer

Havij-Advanced SQL Injection

Web Cruiser Scanner

Acutinex Web Vulnerability Scanner