Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Check if the URL is cached or not by Google.
Reverse the words in a given sentence or paragraph with ease.
Separate text back and forth by new lines, commas, dots...etc.
Extract email addresses from any kind of text content.