RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Visual Expert - An all-in-one Static Code Analysis + SAST tool for PowerBuilder, Oracle and SQL Server
Dynatrace Application Monitoring - Dynatrace is a lightweight, always-on application monitoring solution.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
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.