Top 20 NuGet appender Packages

MongoDB appender for log4net
Log4net appender for Apache Kafka
Its a bridge between NLog and log4net. It hands all log4net logging events over to NLog. So you could use any lib which uses log4net without even using log4net yourself. Simply call the following line and you are done: NLogAppender.Initialize();
Simple log4net appender which logs to the raygun.io API.
Simple log4net appender which logs to the raygun.io API from your MVC application.
log4net Appender for Azure File Storage.
Simple log4net appender which logs to the raygun.io API from your WebApi application.
Simple log4net appender which logs to the raygun.io API from your MVC application.
RabbitMQ appender for log4net
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.
FORK - https://github.com/urielha/log4stash 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.
Custom log4net appender publishing log messages on to RabbitMQ in GELF format. A simple way to integrate your logging with http://logstash.net
Appenders for Apache log4net RemoteSyslogSSLAppender and RemoteSyslogAsyncSSLAppender: Appenders specifically to allow remote SSL logging to a syslog running on a Synology NAS. This should work with any syslog conforming to the BSD specification. EncryptedForwardingAppender: ForwardingAppender to ...
In-memory log4net appender, that streams logging events into IObservable<LoggingEvent>. Unlike MemoryAppender, does not persist any logging events by default.
Log4Net appender for exceptron
Log4Net appender to Quilt4Net. Assure quality in .net systems.
Simple, asynchronous Loggly log4net appender.
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 appender that allow you to replace log information based on a regular expression
Socket Appender (Logstash, Tcp, Udp vs.) For log4net