The RegLookup project is devoted to direct analysis of Windows NT-based registry files. RegLookup provides command line tools, a C API, and a Python module for accessing registry data structures. The project has a focus on providing tools for digital forensic examiners (though it is useful for many purposes), and includes algorithms for retrieving deleted data structures from registry hives.
AirSAM is a desktop GUI that compliments the Web based Snort Alert Monitor. AirSAM gives up to date insight into who might be attacking your network. The ultimate goal is to give audio/visual cues right at the time of the attack. AirSAM is an Adobe Air application and should run on Mac OS, Linux, and Windows.
check_websites is a very simple virus scanner for Web sites. It checks a document root directory for files with the .js extension and for codewords which might be a hint of defacement or SQL injection. This tool is made to run as a cronjob. There's no output on the screen, but it generates a logfile and mails output.