Deception Toolkit - Make your system seem to have network security bugs, and log attack attempts. FakeBo - Fakes trojan servers (Back Orifice, NetBus) and logs every attempt from client. Samhain - A tool for file integrity checking that optionally can be used as a client/server application for centralized monitoring of networked hosts. TCP Wrappers and other security tools - Security tools and papers. A website by Wietse Venema. Flawfinder - Examines source code looking for security weaknesses. Cyber Security and Information Infrastructure Protection - Practical measures for critical infrastructure protection, intrusion prevention and threat assessment. Guarded Memory Move (GMM) - The GMM library can be used to prevent and study buffer overflows exploits