Minify your CSS 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.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Validate JSON content and make it looks good.
Get all possible details about a domain name.
Ping a website, server or port..