yEnc 
A tiny library for yEncoding and decoding with .NET
The library is implemented as a Portable Class Library (PCL), with support for the following platforms (minimum):
- .NET Framework 4.5
- Windows 8
- Windows Phone 8.1
- Windows Phone Silverlight 8
- Xamarin.Android
- Xamarin.iOS (Classic)
It is shipped as a NuGet package.
To install it, simply search for yEnc in the Visual Studio Package Manager window, or write
Install-Package yEnc
In the Package Manager Console.