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
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.