Top 20 NuGet log Packages

Logger facade
Data Patterns for Cortoxa Framework. Cortoxa Framework is a Powerful Framework for faster and easier building .Net applications based on Dependency Injection patterns. Contains implementation of common "Design Patterns".
Skahal.Infrastructure.Framework.Logging.ILogStrategy's implementations.
Extensible Asynchronous File Logger
Miracle diagnostics logging framework
Appender for nlog for logentries.com
Common.Logging.Portable contains the Silverlight 5 implementation of the common.logging library which introduces a simple abstraction to allow you to select a specific logging implementation at runtime.
Mongo appender for Log4net
Provides an object renderer to integrate with log4net to dump exceptions (or any/all object types) using the ObjectPrinter. Also provides a log4net type inspector to prevent prevent dumping log4net objects that should be converted to strings.
Wire up your logging with the NLog logging framework.
Unic script logger
Logary is a high performance, multi-target logging, metric and health-check library for mono and .Net.
Extension Methods If, Switch, Select, In, InRange, Log and more
Common.Log adapter for log4net.
An NLog Target for MongoDB 2.0 Driver persistence. This package targets Mongo C# Driver 2.0
Serializer(s) meant to be used in conjunction w/ the log4net.Ext.Json library.
Provides NLog Target to log to EventBucket (Global Anonymous Event Hub).
log4net simply wrap
Simple log system able to log to the file system, sql server or implement your own log repository very easy
A logging library based on ELMAH to simplify security logging like the following: Log.Login(model.UserName);