Finds all the security information for a given domain name
Domain analyzer is a security analysis tool which automatically discovers and reports information about the given domain. Its main purpose is to analyze domains in an unattended way.
ServicemarX allows you to easily discover, bookmark, and share network services. It extends Bonjour (formerly known as Rendezvous) by expanding its scope Internet-wide. ServicemarX also enables Tiger's Wide Area capabilities. (full source in CVS below)
This library makes SRV records in DNS simple to use; actually, due to the fallback for classical connection mechanisms, it makes building a network connection in general extremely simple.