adlook is a multi-threaded host name and technical contact lookup tool. Reads a list of counted IP addresses (as outputted by uniq -c) from stdin or a file.
BW whois is a replacement for the original whois program which works properly with the modified whois system that resulted from ICANN's takeover of the root domain system.
Geektools Whois is an intelligent whois client written in Perl which automatically determines, queries and returns formatted results from the correct registry for a given domain name or IP address.
gwhois is an universal whois client which can also act as an intelligent whois proxy. whois is an internet service to lookup administrative contacts and owners of domains, ip-adresses or other important parts of the internet infrastructure.
JWHOIS is an Internet Whois client that contains an extensible configuration file which defines its operation. The client supports queries to foreign hosts either through the RFC 954 - NICNAME/WHOIS protocol, the RFC 2167 - Referral Whois 1.5 protocol, or HTTP using an external browser.
KWhois-RH is a KDE3 Client for RedHat and if possible for all whois-clients on the unix market.
mrow is an ugly little perl script which performs gTLD and ARIN whois queries from the unix/dos command line.
The Prefix WhoIs Project provides a whois-compatible client and server framework for disclosing various up-to-date routing information.
whois is an improved whois client. It is part of Debian, Mandriva, SuSE, PLD and other Linux distributions.
Whois2 recursively queries whois servers. This makes it simple to determine the complete information about domain ownership in today's shared registry system.
Xwhois is a small and fast X11 client for quering whois NIC network services.