DBeaver - DBeaver - Universal Database Manager and SQL Client.
ApexSQL Monitor - SQL Server performance monitor - Monitor, detect, and solve SQL Server performance problems on any device
DataGrip - Tool for SQL and databases
dbForge Monitor - dbForge Monitor is a FREE add-in for Microsoft SQL Server Management Studio that allows you to track and analyse SQL server performance.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
Visual Expert - An all-in-one Static Code Analysis + SAST tool for PowerBuilder, Oracle and SQL Server