Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
logstash - logstash is a tool for managing events and logs.
Wazuh - Open Source Host and Endpoint Security
log.io - Real-time log monitoring in your browser
Beats - Beats is the platform for single-purpose data shippers that is installed as lightweight agents and send data to machines to Logstash or Elasticsearch.
Fortinet FortiAnalyzer - Fortinet FortiAnalyzer is a powerful product for Security Fabric Analytics and Automation.