ossec/ossec-hids

Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. It includes our own interfaces for alerting, dashboards, hunting, PCAP, detections, and case management. It also includes other tools such as osquery, CyberChef, Elasticsearch, Logstash, Kibana, Suricata, and Zeek.

Wazuh - The Open Source Security Platform. Unified XDR and SIEM protection for endpoints and cloud workloads.

SQL powered operating system instrumentation, monitoring, and analytics.

Zeek is a powerful network analysis framework that is much different from the typical IDS you may know.

Snort++

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine developed by the OISF and the Suricata community.

TheHive is a Collaborative Case Management Platform, now distributed as a commercial version

Cloud Native Runtime Security

Linux Runtime Security and Forensics using eBPF