Minify your HTML by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Make sure your passwords are good enough.
Get approximate IP details.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Ping a website, server or port..
Use the Google translator API to generate text to speech audio.
Easily remove duplicate lines from a text.