🧠 CISOs: Top 10 Open-Source SIEM Solutions to Try for Free 🧠

Most SIEMs come with a hefty price tag – but did you know some of the most powerful options out there are 100% free and open-source?

If you’re building or optimizing your SOC on a lean budget, these tools can offer serious value without compromising visibility.

Here’s a handpicked list of 10 open-source SIEMs every CISO should consider:

1️⃣ Wazuh – Lightweight, scalable, and packed with threat detection, log analysis, and compliance capabilities.
https://wazuh.com/

2️⃣ TheHive Project – Incident response meets SIEM – great for managing complex investigations.
https://thehive-project.org/

3️⃣ Security Onion – Full Linux distro for threat hunting, IDS, and log analysis.
https://securityonionsolutions.com/

4️⃣ Graylog – Powerful centralized log management with excellent dashboards and alerting.
https://www.graylog.org/

5️⃣ SIEMonster – Built for scalability and based on multiple open-source tools like ELK and Wazuh.
https://siemonster.com/

6️⃣ Elastic SIEM (via ELK Stack) – Combine Elasticsearch, Logstash, and Kibana to visualize threats and trends.
https://www.elastic.co/siem

7️⃣ Apache Metron – Big data SIEM built on Hadoop – ideal for large-scale enterprise analysis.
https://metron.apache.org/

8️⃣ MozDef (Mozilla Defense Platform) – Created by Mozilla to automate incident response.
https://github.com/mozilla/MozDef

9️⃣ AlienVault OSSIM – The classic open-source SIEM with broad community support.
https://cybersecurity.att.com/products/ossim

🔟 Prelude OSS – Modular architecture for detection and correlation, great for custom setups.
https://www.prelude-siem.org/

These solutions offer incredible flexibility and insight when configured right – perfect for proactive teams that want to experiment, test, and deploy fast.

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