SimilarWeb - SimilarWeb.com is a website analysis tool that gives you analytics information for any website.

DNSChecker.org - Check DNS Propagation worldwide. DNS Checker provides name server propagation check instantly. Changed nameservers so do a DNS lookup and check if DNS and nameservers have propagated.

Site Rank Data - View historical rank information of websites via time series charts.

Whats My DNS - Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.

Quantcast - Quantcast Corporation is a digital marketing company that provides free audience demographics measurement and delivers real-time advertising.

NsLookup.io - A simple and powerful tool for querying DNS records