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Best 1 Zeek
Zeek

Zeek (formerly Bro) is the gold standard for open-source network security monitoring. Unlike traditional IDS that focus on signature matching, Zeek performs deep, stateful analysis of network traffic,...

9.0 Excellent
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2 Suricata
Suricata

Suricata is a high-performance, open-source network IDS/IPS and network security monitoring engine. It is designed to be multi-threaded, allowing it to handle high-speed traffic with ease, making it a...

8.9 Very Good
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3 Security Onion
Security Onion

Security Onion is a free, Linux-based distribution that bundles the best open-source network security tools into a single, cohesive platform. It includes Zeek, Suricata, Wazuh, and a powerful ELK stac...

8.0 Very Good
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4 Snort
Snort

Best for: Snort is best suited for experienced network administrators and security profess...

Free Plan Available

Snort is the most famous open-source network intrusion detection and prevention system in history. While it has been surpassed in performance by newer tools like Suricata, it remains a foundational te...

7.8 Good
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