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.
host based intrusion detection
AIDE – Lightweight Linux Host Intrusion Detection
AIDE is a lightweight, open-source Linux host intrusion detection tool for monitoring file integrity and system changes. Ideal for hardened and secure environments.
Best Open Source HIDS Tools for Linux in 2025 (Compared & Ranked)
Explore the top open-source Host-based Intrusion Detection Systems (HIDS) for Linux in 2025. Compare features, use cases, and see which tools are worth deploying.



