If there is a site that should be listed here or if a link goes dead, .

• AIDE Advanced Intrusion Detection Environment
  unix, free, tripwire replacement
  
• ICU (Integrity Checking Utility)
  for executing AIDE filesystem integrity checks on remote hosts from an ICU server and sending reports via email
  
• CodeSafe
  protect EXEs and DLLs from being cracked or run without your permission
  
• Win98, ME, NT, W2K, XP Host Integrity and Audititing
  (June 2001)
  
• Importance of Change Detection whitepaper
  
• Intact Change Detection System nt, w2k, unix, commercial
  
• Intact Open Use NT, free, reduced functionality
  
• Rootkits :
  • adore - linux module backdoor
    
  • Analysis of N.F.O hacking- / rootkit NT, commercial
    
  • Analysis of the KNARK Rootkit
    
  • Carbonite - a rootkit detection and analyzer
    
  • Checkps - a rootkit detection and analyzer
    
  • chkrootkit: shell script that checks system binaries for rootkit modification unix, free
    
  • Linux Rootkit IV
    
  • NT / W2K Rootkit
    
  • rkdet - rootkit detector for Linux
    
  • SucKIT - easy-to-use, Linux-i386 kernel-based rootkit
    works on systems which do not have kernel module support built in
• SecureEXE 100% protection against compromised executables NT, commercial
  
• Slogger: Secure Logger NT, freeware
  Designed to replace the Event Logger, slogger implements a cryptographic protocol called PEO-1 that allows the remote auditing of system logs. Auditing remains possible even if an intruder gains superuser privileges i n the system, the protocol guarantees that the information logged before and during the intrusion process cannot be modified without the auditor (on a remote, trusted host) noticing.

• Veracity File Integrity Assessment windows, unix