StMichael is a LKM that attempts to detect and divert attempts to install a kernel-module backdoor into a running linux system. This is done by monitoring the init_module and delete_module process for changes in the system call table. This is a experimental version, and a spin off from the Saint Jude Project.
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6thsense is a TCP port scanning technique which allows you to remain completely invisible to the scanned host, as described in a Bugtraq post by Antirez. This perl script automates the tedious process.
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Microsoft Security Advisory MS01-024 - A core service running on all Windows 2000 domain controllers contains a memory leak which allows attackers to deplete the servers memory, causing it to become unresponsive. Microsoft FAQ on this issue available here.
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Ldistfp is an identd fingerprinting tool which works well with all Linux and most *BSD hosts that have their auth service running.
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