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UTMStack is a free and Open-source SIEM + XDR Powered by Threat intelligence and real-time correlation. Built for 24x7 Security Operations with Automated Threat Detection and Response. The solution is optimized for MSSPs and organizations looking to align with Security Compliance. <a href="https://utmstack.com/top-five-free-and-open-source-siem/">Open source SIEM</a>