Convert text to binary and the other way for any string input.
Convert text to ascii and the other way for any string input.
Convert text to decimal and the other way for any string input.
Convert text to octal and the other way for any string input.
Get the gravatar.com globally recognized avatar for any email.
Extract email addresses from any kind of text content.
Check if the URL is banned and marked as safe/unsafe by Google.
Check for 301 & 302 redirects of a specific URL. It will check for up to 10 redirects.
Check if the URL is cached or not by Google.
Make sure your passwords are good enough.