Minify your HTML by removing all the unnecessary characters.
Minify your CSS by removing all the unnecessary characters.
Make sure your passwords are good enough.
Get details of any file type, such as the mime type or last edit date.
Get the gravatar.com globally recognized avatar for any email.
Get the web-host of a given website.
Check if the URL is banned and marked as safe/unsafe by Google.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.