Easily convert seconds to minutes.
Easily convert seconds to hours.
Easily convert seconds to days.
Easily convert seconds to months.
Easily convert seconds to years.
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.