OSSEC

OSSEC (Open Source Security Event Log) is a security tool that monitors your computer and network for unusual activity or potential threats. It tracks logs, file changes, and system behaviors to detect and alert you about possible security issues like intrusions, malware, or attempts to tamper with your data. By continuously analyzing these indicators, OSSEC helps organizations respond quickly to security incidents, enhance their defenses, and maintain overall system integrity—all using an open-source platform that is customizable and cost-effective.