YahTool can find available domains that are still listed in Yahoo.
Lookup whois information for any domain name, IP, NIC-handle, ASN and more. It features a self-detecting command line interface, copyright disclaimer removal, optional filtering of Chinese/Korean/Japanese output and webbased config. This is a complet
Allow your customers to search for available domains and place them into a cart. The wizard function can suggest other domains. Offer hosting packages and domain transfers. Configure this script to alert you by email when new orders come in.
Whois Pro is ideal for ISP's, web hosts and the like. It is a very useful utility which can be used to allow customers and potential customers to perform whois lookups for different domains, whois pro comes with three different styles of lookups: Glo
Simple script allows you to lookup and parse TLD's .com, .net, and .org into delimited flatfile databases. All data is extracted including domain owner information, all contacts, email addresses, name servers, and more. Complete whois information is
A web based whois client for RFC-954 compliant whois servers using the shared domain registration system as revised 1 December 1999. You can replace the whois program on your server and run by telnet or run as a CGI script.
A domain script that looks up .com, .net, .org, and .edu domains and retrieves information regarding the specified domain.
A simple whois program that checks the availability of domain names with over 250 extensions. It can be completely customized with HTML templates. Includes error checking and free installation.
A script which will check the availability of any domain name on a regular basis. If it becomes available you will be alerted by email.
Three whois scripts that allow you to search for single, multiple or .name domain names. | 
