zwhois 

Zwhois is a fast and efficient open-source utility that looks up ownership, expiration, and dns information for domains in any tld, ips, or ARIN net-handles.
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A Warp9 Whois Plugin 

Plugin for IE browser; Get Whois info with a push on the button ; Supports multiple TLDs;
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DomainRipper 

DomainRipper is a powerful Whois server lookup utility for Windows 95/98/NT/2000 that helps you keep track of domain names. It can also check the central Whois database periodically and notify you via email as soon as a domain becomes available.
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Domain Name Commando 

Protect your domain names. Automatically polls the appropriate whois servers for your domains, sending you email alerts with before and after views of registrations when anything changes. Receive email alerts when domains expire or become available.
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IP2Location IP-COUNTRY-REGION-CITY-LATITUDE-LONGITUDE-ISP-DOMAIN Database 

IP2Location IP-COUNTRY-REGION-CITY-LATITUDE-LONGITUDE-ISP-DOMAIN is commericial lookup database that translates IP address to country, region, city, ISP, latitude, longitude and domain name. Developers use IP2Location for geolocation projects.
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KFWhois 

KF Whois makes it easy to look up and store domain registration details. It tracks changes to domain registrations and warns you when they are about to expire.
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