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.
Ping a website, server or port..
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Extract email addresses from any kind of text content.
Make sure your passwords are good enough.
Use the Google translator API to generate text to speech audio.