BetterWhois lets you lookup WHOIS information for domains hosted by most registrars.
CIRA WHOIS specializes in lookups for domain names that end with .CA extensions.
DNS Propagation Checkers
DNSPropagation.net and WhatsMyDNS.net let you instantly perform DNS lookups to check a domain names’ current IP address and DNS record information against multiple name servers located in different parts of the world. This allows you to check the current state of DNS propagation after having made changes to your domain’s records.
Email Checker is a free and straightforward tool for verifying whether the email address is real or not.
GeoPeeker.com is a tool for viewing sites from different geographic locations.
Go Daddy lets you lookup WHOIS information and is the world’s largest domain name registrar.
ICANN WHOIS Search
ICANN’s WHOIS lets you lookup WHOIS information for any generic domain.
Trend Micro HouseCall
Trend Micro’s HouseCall Free Online Virus Scan allows you to detect and remove viruses, worms, spyware, and other malicious threats for free. Even if you have other antivirus protection in place, you could use it to get a second opinion if you suspect that malware may have infected a PC.
Online Video Cutter comes in handy when you need to cut a small (MP4, AVI, MPG, or 3GP) video file. It does not require installation and it works in your browser.
With Whois.com lets you lookup WHOIS information for any domain name.