Postman - The Collaboration Platform for API Development
DBeaver - DBeaver - Universal Database Manager and SQL Client.
TablePlus for Windows - A native GUI tool for MySQL, PostgreSQL, SQL Server & more
DataGrip - Tool for SQL and databases
Postman for Mac (Beta) - Build, test, and document your APIs faster
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.