NLog is a powerful, flexible logging system available for all .NET platforms.  It's a great choice when you need very sophisticated log gathering capabilities such as sending log messages from clients to servers, multiple logging levels used simultaneously in the application, and a range of other sophisticated features. 

Loupe provides built-in integration with both NLog 1.0 and NLog 2.0 using the Log Target extensibility built into NLog.  This is basically a single class (Gibraltar.Agent.NLog.GibraltarTarget) that is available as both source code (GibraltarTarget.cs) and an assembly on NuGet.

 You can download the latest version of NLog, get support, and read documentation common scenarios at the NLog Project Web Site.