RedGate SQL Monitor is described as 'Alerting – Discover issues before they have an impact Diagnosis – Uncover obstacles and find root causes Performance – See what has the biggest impact on your system Overview – View your SQL Server estate at a glance Reporting – Share tailored reports about your servers'. There are three alternatives to RedGate SQL Monitor for Windows and Self-Hosted solutions. The best alternative is dbForge Monitor, which is free. Other great apps like RedGate SQL Monitor are Navicat Monitor (Paid) and ApexSQL Monitor (Paid).
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.
ApexSQL Monitor monitors various performance counters including SQL Server, system, database and AlwaysOn availability group performance counters. These are the most important parameters that help to prevent the toughest performance problems.