Wazuh - Open Source Host and Endpoint Security
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Fortinet FortiAnalyzer - Fortinet FortiAnalyzer is a powerful product for Security Fabric Analytics and Automation.
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.
Riemann - Container Monitoring
Prometheus - An open-source systems monitoring and alerting toolkit.