Whois Index - Whois Lookup Tool
CoolWhois.com - the WHOIS that lets you search any domain!
One API 4 SMS - API to Send SMS and Receive SMS by Long Code and Short Code
Introducing the Beta Launch of the New ICANN WHOIS Lookup Tool
WHOIS Search, Domain Name, Website, and IP Tools - Who.is
ViewDNS.info - Your one source for DNS related tools!