Easily convert years to seconds.
Easily convert years to minutes.
Easily convert years to days.
Easily convert years to weeks.
Easily convert years to months.
Get the gravatar.com globally recognized avatar for any email.
Take an IP and try to look for the domain/host associated with it.
Check if the URL is cached or not by Google.
Get all possible details about an SSL certificate.
Get & verify the meta tags of any website.
Make sure your passwords are good enough.