Abtrusion Security Provides security software for Windows NT to prevents the loading of software that has not been safely installed on the computer. http://www.abtrusion.com/
Microsoft Security Technical and how-to information about security for IT professionals, developers and those new to security. http://www.microsoft.com/security/
NTSecurity.com One stop portal for NT security related information and products. http://www.ntsecurity.com
Shavlik Technologies A company providing Microsoft based security solutions to fortune 500 and medium sized businesses. http://www.shavlik.com/
Small Wonders Software Develops products for managing and reporting NTFS permissions on Microsoft based servers. http://www.smallwonders.com/
Trusted Systems Services A secure systems consulting, service, and training company specializing in Windows NT security. Provides NT security products and publications. http://www.trustedsystems.com/