DNSQuerySniffer - DNSQuerySniffer is a system sniffer utility that demonstrates the DNS inquiries sent on your framework.
intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
DNSInspect - DNS is a free online service to check your domain’s servers for common DNS and mail errors and produces a report with explanations how to fix them.
Dnsstuff - DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering.
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.
Audit DNS - Audit your domain name DNS settings easily and quickly.