Make sure your passwords are good enough.
Ping a website, server or port..
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Convert your text to any kind of text case, such as lowercase, UPPERCASE, camelCase...etc.
Count the amount of characters and words of a given text.
Get & verify the meta tags of any website.
Use the Google translator API to generate text to speech audio.