OSSEC is a powerful open source host-based intrusion detection system (HIDS) for Linux, Windows, and Unix. It provides log analysis, file integrity monitoring, rootkit detection, and real-time alerting.

Darknet

Source: Darknet
Source Link: https://www.darknet.org.uk/2025/06/ossec-open-source-host-based-intrusion-detection-for-linux-windows-and-unix-systems/