blq is a Perl script that queries one or more lists, such as the MAPS RBL or MAPS DUL, to determine if a host is listed as a potential source of spam or email abuse.
xtail is sort of a tail -f for many files. It's a great way to monitor log files.
The web-chpass utility allows users to change
their account password through the Web. It
was written with security and flexibility as the
primary concerns, and runs on systems that
use PAM to manage user authorizations.
pxytest is a commandline utility which tests a host for open proxies
that are vulnerable to spammer abuse.
A tool for securing DNS communications between a client and a DNS resolver.
A polyhedral extraction tool (PET).