BuiltWith - https://builtwith.com/

Domain Dossier - https://centralops.net/co/

DNSlytics - https://dnslytics.com/reverse-ip

SpyOnWeb - https://spyonweb.com/

Virus Total - https://www.virustotal.com/

Visual Ping - https://visualping.io/

Back Link Watch - http://backlinkwatch.com/index.php

View DNS - https://viewdns.info/