Minify your HTML by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Get approximate IP details.
Get all possible details about an SSL certificate.
Validate JSON content and make it looks good.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about a domain name.
Ping a website, server or port..