IPTables log analyzer displays Linux 2.4 iptables logs (rejected, accepted, and masqueraded packets) in a nice HTML page. The reports it produces are easy to read and understand, reducing the manual analysis time. They contain statistics on packets and links to more detailed information on a given host, port, or domain.
guard bash is a shell wrapper that will execute an authentication phase before any command is executed. It uses a secret (user owned) algorithm method, and has a per user customizable procedure. If you need to connect to your computer from outside of your safe environment, even if you use SSH, you are vulnerable to simple attacks like key sniffing or to more complex attacks against SSH. If you have more than just one authentication method, you can more safely log in your account from an insecure Internet host.
auditunlink is a Linux shared library that intercepts the unlink system call, and logs which process, program, and user initiated it, and to which file the call was applied. It is designed to be loaded with LD_PRELOAD or /etc/ld.so.preload, and allows system administrators to log file deletions even if a user has the proper file system permissions to perform the deletion.