Prometheus - An open-source systems monitoring and alerting toolkit.
Netumo - Ensure healthy website performance, uptime, and free from vulnerabilities. Automatic checks for SSL Certificates, domains and monitor issues with your websites all from one console and get instant notifications on any issues.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
AppZero - AppZero is a monitoring and migration tool that allows users to keep track of different applications and servers in both simple and complex IT environments.
Fluent Bit - Data collector and log forwarder.
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems