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Linux Audit and Intrusion Detection
InterSect Alliance are the creators of the SNARE Linux C2-style Audit module, and have a consulting background in advanced audit analysis, intrusion detection systems, and forensics for Unix and other operating systems. http://www.intersectalliance.com/
Internet Filtering System
Pearl Software\'s solutions provide user-level monitoring and Internet access policies in client-server, server-centric, peer-to-peer and stand-alone computing environments.
Hacking Linux Exposed
Companion Website to Hacking Linux Exposed, Osborne/McGraw-Hill. Source code from the book, updates, and other tools to secure your Linux system.
Ironport email security servers
Ironport email security servers stop spam and allow you to enforce your company's email security policy.
Linux Secu
Linux Security, server hardening, 1U server, 24x7 server admin, monitoring, IDS, NDS, firewalls.
NTSecurity.com
One stop portal for NT security. One of the largest portals for NT security related information and products.