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..
Extract email addresses from any kind of text content.
Use the Google translator API to generate text to speech audio.
Convert forum type bbcode snippets to raw HTML code.
Decode Base64 input to an image.
Convert text to binary and the other way for any string input.