Serilog - Backend Development and Utilities
Logary - Professional logging metrics and analytics for your apps
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.
LOGBack - Logging framework
ZeroLog - ZeroLog is a JSON logging library that allows you to log messages in a structured, searchable, and easily parseable format and allow for customizable output.