Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
Sketch - Professional digital design for Mac.
MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
Affinity Designer - Professional creative software, exclusively for Mac.
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.