Online vulnerabilty assessment using open source tools
- Free Nmap port scan. An internet server vulnerability assessment and a web server vulnerability assessment are also available.
- http://www.hackertarget.com

EventLog Scan
- Scans event logs for high security events happening on your machine.
- http://www.EventLogScan.com

Xentinel Digital Security
- Offers 'hacker free' website security certifications, in conjunction with the scanning services offered.
- http://www.libredehackers.com/

Security Innovation
- Independent provider of application security services.
- http://www.securityinnovation.com

MaxPatrol
- Private company specializing in network information security
- http://www.maxpatrol.com

Control Scan
- Provides third party verification and services to identify, measure and prioritize security.
- http://controlscan.com

Network Analyzing
- Offers web server scanning services.
- http://www.networkanalyzing.com/

Beyond Security SA
- Provider of security and vulnerability assessment solutions.
- http://www.beyondsecurity.co.za

Digital Stakeout
- Provides a self-managed scanning solution to identify and help defend against vulnerabilities.
- http://www.digitalstakeout.com

Vulnerability Assessment & Network Security Forums
- Offers an open source database of vulnerabilities.
- http://www.vulnerabilityscanning.com/

Prosumis
- Automated vulnerability monitoring for web servers.
- http://www.prosumis.com

InProtect
- Provides online Nmap and Nessus based security scans.
- http://www.inprotect.com

Perisec
- Web-based multilingual vulnerability scanner with reporting, scheduling, alarming and policy management.
- http://www.perisec.com

Dalian Enterprises, Inc.
- Performs security audits on wired or wireless networks.
- http://www.daliansecurity.com

Symantec Security Check
- Tests your exposure to a wide range of online threats.
- http://security.symantec.com/

Sword & Shield
- Consulting firm offering penetration testing and vulnerability audit services.
- http://www.sses.net/

Vulnerability Scanning Solutions, LLC
- Offers assessment, analysis, firewall testing and port scan services for home and business users.
- http://www.networkscanning.com/

Firewall Test and Port Scan at AUDITMYPC
- This online security audit is free, extremely fast and provides immediate results designed to promote security awareness.
- http://www.auditmypc.com

ScanAlert
- Vulnerability testing and security verification. Provides real-time independent verification of a Web site's security.
- http://scanalert.com

Security Point(R) Scanner
- Analyzes a company's Internet security through the internet with their own SPScanner security tool.
- http://www.secpoint.com

SecurityMetrics, Inc.
- Web based security services to detect and repair security vulnerabilities on multiple platforms. Internal and external security solutions, provides vulnerability assessment, and intrusion detection systems.
- http://www.securitymetrics.com/

Edgeos
- Offers vulnerability assessment services. Based in Chandler, Arizona.
- http://www.edgeos.com/

ScannerX
- A web based ASP of the Nessus scanning engine and proprietary programming and vulnerability assessment tools.
- http://www.scannerx.com/

It-sec
- Free online security scan of ones computer, tests for open Netbios, Netbus, and Back Orifice.
- http://www.it-sec.de/vulchke.html

Sense of Security
- Network auditing service.
- http://www.senseofsecurity.com/

HackerWhacker
- Free Internet based security scanner site that will provide a report on what personal information is available to hackers over ones Internet connection.
- http://www.hackerwhacker.com/