Best Top 10 open source SIEM solutions 2019

Open source OSSEC

OSSEC is a open source and free to use Host Intrusion Detection system. OSSEC contains a lot of features that can be tweaked and configured, and it also allows you to create custom alert rules or scripts that can take action when events are raised.

OSSEC dashboard

The community behind OSSEC is huge and there is a lot of documentation available.