POWERwhois allows you to use the whois program on your server to easily search the InterNIC domain name database via a web-browser. This is a free service from InterNIC which allows you to search their complete database of domain names for either the availability of a domain, or information about the owner(s) of a certain domain. It is easily customized using a template within the script, and is all done within one file.
WS domain name finder is perfect for domain registration companies. Its a fact that good sounding domain name are getting very difficult to find, with this program all it requires are a few chosen keywords and domain name finder will search for lots of unregistered domains, hunting out those forgotten about domains.