OSSEC offers a free, open source host intrusion detection system with customizable security rules, machine learning, and multi-platform support.
Customize your intrusion detection for free
OSSEC is an open source platform designed to help you monitor and secure your systems with advanced host intrusion detection. With support for multiple operating systems, you can easily tailor OSSEC to fit your unique security requirements, whether you're a beginner or an experienced IT professional.
You can take advantage of its flexible configuration options, add your own alert rules, and even write custom scripts to automate responses. OSSEC+ further enhances these capabilities by offering machine learning-based features at no cost, just by registering. The site also provides extensive documentation, forums, and support to help you make the most of your security setup.
Whether you're protecting a single server or managing a complex infrastructure, OSSEC gives you the tools to detect threats, stay compliant, and respond quickly—all while remaining free and open source.
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