OSSEC - World's Most Widely Used Host Intrusion Detection System - HIDS. OSSEC is a multiplatform, open source and free Host Intrusion Detection System (HIDS). You can tailor OSSEC for your security needs through its extensive configuration options, adding custom alert rules and writing scripts.
Atomicorp Unified Workload Security Platform - Built on OSSEC - Atomicorp. Atomicorp provides unified workload security for the cloud, datacenter, or hybrid environments. Built on OSSEC, the world's leading open source server protection platform.