nagios-config-build is a group of shell scripts that generate Nagios configuration files from a list of hostnames. It automatically resolves IP address from DNS and provides a quick way to manage a large number of hosts without having to set up a complicated system.
ipset_list is a wrapper script for listing sets of the netfilter ipset program. It allows you to match and display sets, headers, and elements in various ways. Optionally, the output can be colorized.