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Now you can offer an Internic Domain Name Lookup on your site. This little script installs on both Unix and Windows servers in a matter of minutes. You can also modify it to execute any operating system command, but be careful.
Price: Freeware

CC Whois is a domain looker-upper. The latest version now allows you to query not only the Internic database, but over 50 foreign domain name databases as well. Very easy to set up and with improved configurability.
Price: Freeware

Full featured domain look up script. Look up unlimited domains at one time, create your own hosting plans for your company, and have users pay online.
Price: $99.95/Free for Members

Notifies you of deleted domains.
Price: $79.00

Easy Domain Search Page Maker! - give away Domain Search pages to your guests.
Price: Freeware

This script allow you to automatically check expired domains in LookSmart directory in selected categories and send you via email list of expired domains. It run daily via cron after drop time of OpenSRS domains database and collect expired domains.
Price: $400.00

The MultiDom range are widely considered to be the fastest domain lookup solutions in the World. Supports multiple parallel searches, whois, and DNS lookup. Includes comprehensive Web admin area - compatible with OpenSRS, WorldPay, Paypal etc. Also interpretation and validation of user input and customisable templates.
Price: £95/£225/£275

Net::DNS is a DNS resolver implemented in Perl. It allows the programmer to perform nearly any type of DNS query from a Perl script. This module is required by many scripts, including some here on the CGI Connection, such as our E-mail Verifier. If your hosting company does not have this module intalled, you should get it. This is not a standalone script, but is used in conjunction with other scripts.
Price: Freeware

This script allow you to automatically check expired domains in Dmoz (ODP - Open Directory Project) directory in selected categories and send you via email list of expired domains. It run daily via cron after drop time of OpenSRS domains database and collect expired domains.
Price: $300.00

This MySQL database driven Whois Domain Spider script is design to scan hundreds of thousands domains for their status and time expiring and save the information in a MySQL database. Thousands of previously registered domain names become available for registration each week because the previous owner fails to renew his/her domain registration? Many of these names can be extremely valuable to you or your company, but you may not know about them until it is too late.
Price: $119.95