OSSEC is a full platform to monitor and control your systems. It mixes together all the aspects of HIDS (host-based intrusion detection), log monitoring and SIM/SIEM together in a simple, powerful and open source solution.
 
OSSEC watches it all, actively monitoring all aspects of Unix system activity with file integrity monitoring, log monitoring, rootcheck, and process monitoring. With OSSEC you won't be in the dark about what is happening to your valuable computer system assets. 
When attacks happen OSSEC lets you know through alert logs and email alerts sent to you and your IT staff so you can take quick actions. OSSEC also exports alerts to any SIEM system via syslog so you can get real-time analytics and insights into your system security events.

OSSEC is a full platform to monitor and control your systems. It mixes together all the aspects of HIDS (host-based intrusion detection), log monitoring and SIM/SIEM together in a simple, powerful and open source solution.

OSSEC -  Host-based Intrusion Detection System

Bro is a powerful network analysis framework that is much different from the typical intrusion detection system you may know. Bro provides a comprehensive platform for more general network traffic analysis as well. 
 
Bro is a passive, open-source network traffic analyzer. It is primarily a security monitor that inspects all traffic on a link in depth for signs of suspicious activity. More generally, however, Bro supports a wide range of traffic analysis tasks even outside of the security domain, including performance measurements and helping with trouble-shooting.
 
Bro comes with built-in functionality for a range of analysis and detection tasks, including extracting files from HTTP sessions, detecting malware by interfacing to external registries, reporting vulnerable versions of software seen on the network, identifying popular web applications, detecting SSH brute-forcing, validating SSL certificate chains, and much more.

Bro is a powerful network analysis framework that is much different from the typical intrusion detection system you may know. Bro provides a comprehensive platform for more general network traffic analysis as well. 

Bro - Network Security Monitor

Wazuh helps you to gain deeper security visibility into your infrastructure by monitoring hosts at an operating system and application level. This solution, based on lightweight multi-platform agents, provides the capabilities like Log management and analysis, File integrity monitoring, Intrusion and anomaly detection, Policy and compliance monitoring. 

Wazuh - Host and endpoint security

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OSSEC - Host-based Intrusion Detection System

Bro - Network Security Monitor

Wazuh - Host and endpoint security

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