GRC Internet Security Detection System scans on request the user's computer, especially the Windows file sharing and reports vulnerabilities. https://grc.com/x/ne.dll?bh0bkyd2
Public Key Infrastructure specialists offer security solutions, including certificate authorities, cryptographic toolkits for Java, C and XML; hardware cryptographic devices and security applications. http://www.baltimore.com/
A distributor of network and internet security solutions like firewalls, anti virus and general security solutions across the UK. http://www.e92plus.com
Tests PCs or web sites for vulnerabilities, trojans, root exploits and more using a web based auditing tool with over 460 vulnerability tests. Free registration required. http://www.securityspace.com/smysecure/
Internet monitoring and response security service for small to mid-sized businesses and home users to ensure a secure Internet connection. http://www.secureworks.com/
Specializes in network security and related technology consulting services. Headquartered in Tempe, Arizona, and has a nationwide presence of consultants. http://www.iis.com/