"Security experts always advise you to use only strong
alphanumeric passwords for network applications, and change them
often, but you know that not everyone on your network is
security-conscious. Starting to worry that weak passwords may be
slipping through your defenses? Then it's time to unleash Hydra, a
network login cracker for more than 30 network services.
"Hydra comes from The Hacker's Choice (THC), a group that has
written more than 60 open source network security tools and
research papers. Hydra receives frequent updates and is the group's
second most downloaded project..."