Prometheus - An open-source systems monitoring and alerting toolkit.
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.
Fluent Bit - Data collector and log forwarder.
Riemann - Container Monitoring