Iban 

- Want to know who is or owns an ip address or domain? - Search worldwide for interesting domains. - Hear when a line breaks down/is up. - Know why you can not reach a domain. - Solve internet problems from your desk. - New: Reports printable
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DomainInspect 

Advanced domain name checker designed to do WHOIS lookups and link popularity checks of more than 100 TLDs. Domain names can be inputted manually, imported from file, or generated automatically by using keywords.
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Reggie Pro 

Find out about free and expiring domain names easily Google search engine ranking helps you find popular expired domain names Includes 10 dictionaries (almost a million words with support for extended characters) Multithreaded=many times faster
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PlexDomain: Domain-Name Search, Generation, Popularity and Analysis Toolkit 

PlexDomain: Domain Analysis Tool. It searches deleted or expired domains with high ranking and popular links. Also, it generates domain names from keywords.
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