Minify your CSS by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Take an IP and try to look for the domain/host associated with it.
Make sure your passwords are good enough.
Generate passwords with custom length and custom settings.
Ping a website, server or port.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about an SSL certificate.