arpalert uses ARP address monitoring to help prevent unauthorized connections on the local network. If an illegal connection is detected, a program or script is launched, which could be used to send an alert message, for example.
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Advchk (Advisory Check) reads security advisories so you do not have to. Advchk gathers security advisories using RSS feeds, compares them to a list of known services, and alerts you if you are vulnerable. Since adding hosts and services by hand would be quite a boring task, advchk leverages nmap for automatic service and version discovery.
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afick is another file integrity checker, designed to be fast and fully portable between Unix and Windows platforms. It works by first creating a database that represents a snapshot of the most essential parts of your computer system. Then a user can run the script to discover all modifications made since the snapshot was taken (i.e. files added, changed, or removed). The configuration syntax is very close to that of aide or tripwire, and a graphical interface is provided.
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