Take an IP and try to look for the domain/host associated with it.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Make sure your passwords are good enough.
Convert miles per hour (mph) to kilometers per hour (kph) with ease.
Use the Google translator API to generate text to speech audio.
Convert your HEXA color format to RGB format.