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MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Dnsstuff - DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering.
DataGrip - Tool for SQL and databases
intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.