WhoDomLite  

WhoDomLite is an advanced Whois domain name search Lookup script used to determine the status of a given domain name. Now uses the Shared registry system and supports .com .net .org .info .biz .co.uk and .org.uk.

Price: Free

   AceWhois  

Features: Will Show full whois output including contact details. Option to show either full output or available / unavailable. Uses HTML Templates for ease of use. Will run on NT and Unix. Secure as it is all self contained. No external whois program required. Advanced error checking for misformed domain names.

Hosting Requirements: Unix, Win NT; Perl 5
Price: Free

   BW Whois  

BW Whois is a modern whois client with a lot of features: Self-detecting CGI support; Simple command-line use; Prevents data harvesting with multiple security features for web use; Optional result caching with an SQL database; Support for available/not available results; Fully customizable HTML output; Support for Apache-style SSI (server-side includes); External TLD table for support of ALL top-level domains; Fully configurable disclaimer stripping; Automatic support for netblocks; Unpacks packed (single-integer) IP addresses.

Price: Free