nxlog - NXLog offers log management solutions for companies of all sizes.
Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
Wazuh - Open Source Host and Endpoint Security
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
Fortinet FortiAnalyzer - Fortinet FortiAnalyzer is a powerful product for Security Fabric Analytics and Automation.