Top 20 NuGet log4net Packages

DO NOT USE. Instead simply use the JSNLog package.
Log4Net client library for the Google Stackdriver Logging API.
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).
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...
NLog appender which sends logs to the Sumo Logic machine data platform.
Shared library used by .NET log appenders uploading to Sumo Logic.
Castle log4net integration, logging services from Apache based on log4j
Adds detailed tracing to any method without modifying your source code. Several backends are available as separate NuGet packages. An official PostSharp pattern library.
DO NOT USE. Instead simply use the JSNLog package.
Log JavaScript errors and other client side events in your Log4Net server side log. Installs JSNLog and configures it for use with Log4Net. Use with ASP.NET 4.x.
Apache log4net appender that writes to the Seq event server over HTTP.
Allows to configure Log4net as Microsoft Extensions Logging handler on any ASP.NET Core application. Original code proposal by @anuraj --> https://dotnetthoughts.net/how-to-use-log4net-with-aspnetcore-for-logging/
PostSharp.Patterns.Diagnostics: support for Log4Net.
A modern high performance cross platform wrapper around Log4Net.
Log Audit.NET Audit Trail using Apache log4net™
log4net.Elasticsearch is a log4net adapter for easy logging of exceptions and messages to Elasticsearch indices. Tested through Elasticsearch 6.2.1
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.
log4net Logger for Apache Ignite
log4net appender for kafka, especially to connect to logstash