log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.
Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
Serilog - Backend Development and Utilities
Wazuh - Open Source Host and Endpoint Security
LOGBack - Logging framework
logstash - logstash is a tool for managing events and logs.