Hackbot is a vulnerability and banner grabber meant as auditory tool for remote and local hosts. Hackbot requires PERL (http://www.perl.org), IO::Socket, Net::hostent and Getopt::Std that should come with your default PERL installation.
Hackbot scans over 300 CGI's, scans for banners of several services, does Unicode checks, checks for open relays, outsmarts Cisco PIX MailGuard, can do ripe checkup, SpamCOP DB checkup, X connect test and lots more.