Top 20 NuGet log4net Packages

Redistributable components for package 'PostSharp.Patterns.Diagnostics'. This package should only be installed as a dependency. (This is not the package you are looking for).
Castle Windsor logging facility lets you easily inject loggers into your components. It offers integration with most popular 3rd party logging frameworks like log4net, NLog and Serilog (see Castle Core docs).
log4stash is a log4net appender for easy logging of exceptions and messages to Elasticsearch indices. You can configure few filters to analyze log events before they got sended to Elasticsearch similar to the filters on logstash.
DO NOT USE. Instead simply use the JSNLog package.
NLog appender which sends logs to the Sumo Logic machine data platform.
Provides log4net logging integration for other ServiceStack projects
Adds detailed tracing to any method without modifying your source code. Several backends are available as separate NuGet packages. An official PostSharp pattern library.
Contains a set of interfaces to be implemented by any logger.
AdoNetAppender for .Net Core log4net people
log4net.Elasticsearch is a log4net adapter for easy logging of exceptions and messages to Elasticsearch indices. Tested through Elasticsearch 6.2.1
Castle log4net integration, logging services from Apache based on log4j
JavaScript logging package that lets you log exceptions, AJAX timeouts and other client side events in your server side log. Supports ASP.NET 4.x (.Net 4.5.2+) and ASP.NET CORE (.NETStandard 2.0+).
A source code package designed primarily for library and framework authors who want dependency free logging support in their component. Also useful in end applications. As of 5.0.0 it works with NetStandard2.0 and SDK projects. For legacy csproj format support use 4.x versions. If you are a library...
Allows to configure Log4net as Microsoft Extensions Logging handler on any ASP.NET Core application. Original code proposal by @anuraj -->
MetroLog is a lightweight logging framework designed for portable code and WinJS. Although the API is based on NLog and log4net, the intention is that it's a very basic logging system. This version targets .NET Core, .NET 4.5, Windows 8.1 (Windows Store apps), Windows Phone 8, WinPhone 8.1, W...
PostSharp.Patterns.Diagnostics: support for Log4Net.
log4net logging adapter for Akka.NET
Serilog event sink that writes to Log4Net. Merge your new Serilog event stream into your existing log4net infrastructure.
Apache log4net appender that writes to the Seq event server over HTTP.
Enable JSON logging in log4net, stamp log messages, entertain keep-alive appender