Minify your HTML by removing all the unnecessary characters.
Minify your CSS by removing all the unnecessary characters.
Extract email addresses from any kind of text content.
Get approximate IP details.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about a domain name.
Take an IP and try to look for the domain/host associated with it.
Convert a particular date to the unix timestamp format.