log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.
LOGBack - Logging framework
Serilog - Backend Development and Utilities
Logary - Professional logging metrics and analytics for your apps
Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.