Handy online tools

Tools for various uses.

GWhois
Unrelated to the  package available through the Ubuntu repositories, GWhois performs whois lookups in such a way that all domains can be found, even brand-new ones not available through other whois lookup tools.

icanhazip.com
Serves current IP address in plain text, which is the only content of the entire page.

[mailinator.com/ Mailinator]
Amazingly simple webmail server, particularly useful for testing user setups of packages. Also great for creating throwaway email addresses when creating online accounts without revealing a legitimate email address.