Deva.Tracking (nuget): A library that makes a very common task quite a bit easier. It's used for persisting and applying various types of application settings.   Basically you would configure the library with a few lines of code, and then just tell it which properties of which objects need to be persistent (survive a shutdown).  No more copying data from .config/.settings files to objects and back again to make the data survive an application shutdown.  The library is tiny (under 500 LOC), very customizable and provides many extension points, but comes with all the basic stuff built in.   The source repository is on github, and there is an article describing it on codeproject. The article is a bit dated, but some new how-to articles will be available soon. 
Keywords: .NET|Settings|Persistence