OSSEC

OSSEC is ranked #6 of 27 in intrusion detection and prevention software on The Geeks Club. It runs on Linux, macOS, Self-hosted, Windows. There is a free plan. A free trial is offered. Paid plans start at $5/mo.

OSSEC plans and pricing

All plans

OSSEC Free command line · core OSSEC rules · no dedicated support staff ossec.net · 1 Oct 2026

OSSEC+ Free registration required machine learning · ELK stack · 1000s of new rules · threat sharing ossec.net · 1 Oct 2026

Atomic OSSEC $5/mo per device enterprise features · GUI · professional support · advanced rules ossec.net · 1 Oct 2026

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Free plan: Yes

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OSSEC

What it does: OSSEC is a scalable, multi-platform, open-source host-based intrusion detection system.
Detection capabilities: OSSEC provides log analysis, file-integrity checking, Windows registry monitoring, centralized policy enforcement, rootkit detection, real-time alerting and active response.
Monitoring modes: OSSEC supports both agent-based and agentless monitoring of systems and network components such as routers and firewalls.
Alert integrations: SMTP, SMS and syslog integrations can send alerts to email-enabled devices, and active response can block an attack immediately.
Centralized management: OSSEC provides a centralized management server for policies across multiple operating systems with server-specific overrides.
Compliance: OSSEC helps address PCI and HIPAA requirements, including file-integrity monitoring, log inspection and policy enforcement.
Supported systems: OSSEC runs on Linux, OpenBSD, FreeBSD, MacOS, Solaris and Windows.
OSSEC+ enhancements: OSSEC+ adds machine learning, ELK stack integration, real-time community threat sharing and thousands of new rules.
Commercial support: Atomicorp provides OSSEC deployment assistance and post-sale support services.
Product limitation: The OSSEC and OSSEC+ editions provide command-line management, while the Atomic OSSEC editions provide a management console.
Enterprise integrations: Atomic OSSEC includes native integrations for AWS, Azure, GCP, Splunk, Arcsight, OpenSearch, ELK, Slack, PagerDuty, Jira, Cloudflare, Amazon S3 and Glacier.
Security and compliance features: Atomic OSSEC includes advanced encryption using PKI and Noise Socket, compliance auditing and reporting, vulnerability management, antivirus protection and firewall management.
Trial: Atomic OSSEC SaaS offers a free 14-day trial for up to 10 endpoints with no credit card required.
Origin: OSSEC was created in 2004 by Daniel B. Cid.
Price from: $5/mo

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Sources

ossec.net/docs/about.html· checked 1 Oct 2026
ossec.net/docs/docs/manual/non-technical-overview· checked 1 Oct 2026
ossec.net/register-for-ossec/· checked 1 Oct 2026
ossec.net/ossec-downloads/· checked 1 Oct 2026
ossec.net/products/· checked 1 Oct 2026
ossec.net/ossec-development-timeline/· checked 1 Oct 2026
ossec.net· checked 1 Oct 2026