Apps with 'Database Monitoring' feature
netdata is a system for distributed real-time performance and health monitoring.
Checkmk is comprehensive IT monitoring solution in the tradition of Nagios. Checkmk is available as Raw Edition, which is 100% pure open source, and as Enterprise Edition with a lot of additional features higher performance and professional support.
dbForge Monitor is a FREE add-in for Microsoft SQL Server Management Studio that allows you to track and analyse SQL server performance.
Navicat Monitor is simple and agentless remote server monitoring tool that allows you to effectively monitor MySQL, MariaDB, SQL Server, Amazon RDS, Amazon Aurora, Oracle Cloud, Google Cloud and Microsoft Azure.
Agentless monitor covers most of the aspects of monitoring like JAVA / J2EE application monitoring, server monitoring, database monitoring, transaction monitoring, network...
ManageEngine Applications Manager provides performance monitoring for 100+ business applications and infrastructure elements, spanning physical, virtual and cloud environments. It helps quickly detect, isolate, and resolve performance issues.