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 approximate IP details.
Get all possible details about an SSL certificate.
Ping a website, server or port..
Convert your text to any kind of text case, such as lowercase, UPPERCASE, camelCase...etc.
Get & verify the meta tags of any website.
Use the Google translator API to generate text to speech audio.