Make sure your passwords are good enough.
Get the gravatar.com globally recognized avatar for any email.
Get all possible details about an SSL certificate.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Upload a QR code image and extract the data out of it.
Get all possible details about a domain name.
Check for 301 & 302 redirects of a specific URL. It will check for up to 10 redirects.