Upload a QR code image and extract the data out of it.
Extract email addresses from any kind of text content.
Get approximate IP details.
Take an IP and try to look for the domain/host associated with it.
Make sure your passwords are good enough.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Count the amount of characters and words of a given text.