Apache Log4net is a versatile, feature-rich, efficient logging API and backend for .NET
Seelog is a native Go logging library that provides flexible asynchronous dispatching, filtering, and formatting.
Log4r is a comprehensive and flexible logging library for use in Ruby programs. It features a heirarchical logging system of any number of levels, custom level names, multiple output destinations per log event, custom formatting, and more.
A lightweight and customizable file logger implementation for the Microsoft.Extensions.Logging framework.