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