DNSsy

Provides a comprehensive test and report on the health of your DNS.

3 Alternatives To DNSsy

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Check

Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.

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.

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.