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.
Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
Syslog-ng - Syslog-ng decreases the quantity and improves the quality of data, thus enhancing the capacities of your SIEM solution.
Wazuh - Open Source Host and Endpoint Security
Fortinet FortiAnalyzer - Fortinet FortiAnalyzer is a powerful product for Security Fabric Analytics and Automation.
logstash - logstash is a tool for managing events and logs.