intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
cutestat - Website Stats and Valuation. CuteStat.
SolveDNS - SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.
Rankchart - Rankchart is one of the unique websites that allows you to examine your websites or watch competitors and locate rich information about website technologies, site reputation, errors, SEO, and ad-word recommendations.
MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
Site Worth traffic - Site Worth traffic is a cost-effective site that is introduced to estimate the value, daily page views, daily visitors, and daily revenue of a website.