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).
Log4net Logging extension for Ninject
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.
NLog appender which sends logs to the Sumo Logic machine data platform.
log4net.Elasticsearch is a log4net adapter for easy logging of exceptions and messages to Elasticsearch indices. Tested through Elasticsearch 6.2.1
Adds detailed tracing to any method without modifying your source code. Several backends are available as separate NuGet packages. An official PostSharp pattern library.
Custom log4Net Appender to send logs to Loggly
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...
Unity adapter for log4net
Provides log4net logging integration for other ServiceStack projects
PostSharp.Patterns.Diagnostics: support for Log4Net.
Abp.Castle.Log4Net
Apache log4net appender that writes to the Seq event server over HTTP.
Log Audit.NET Audit Trail using Apache log4net™
Log4Net client library for the Google Stackdriver Logging API.
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/
Log4net appender that sends log entries to Exceptionless. Exceptionless is a cloud based error reporting service that sends your exceptions to https://exceptionless.com and provides aggregated views and analytics.
Log4net appender that sends log entries to Exceptionless. Exceptionless is a cloud based error reporting service that sends your exceptions to https://exceptionless.com and provides aggregated views and analytics.