Icon Checker

https://realfavicongenerator.net

Resolve Website to IP Address

www.infosniper.net

Reverse IP Lookup

mxtoolbox.com/ReverseLookup.aspx

https://hackertarget.com/reverse-ip-lookup/

DNS Checker

https://dnsspy.io/

Reverse Website Lookup

viewdns.info/reverseip

Server Blacklist by IP

www.whatismyip.com/blacklist-check

Email Blacklist by IP

mxtoolbox.com/blacklists.aspx

SSL Certificate Checker

www.ssllabs.com/ssltest

Broadband Line Checker

www.dslchecker.bt.com/adsl/ADSLChecker.TelephoneNumberOutput

UI Test Tool Collection

https://uitest.com/

View Web Headers

https://www.webconfs.com/http-header-check.php

Get all URLs from a page

https://hackertarget.com/extract-links/