Though its developer announced that development for Accord.NET might have reached its end a few months ago, that doesn’t mean that you can’t take advantage of it. This is yet another .NET framework for machine learning, computer vision, and image processing, among others.
Accord.NET is a framework for scientific computing in .NET. The source code of the project is available under the terms of the Gnu Lesser Public License, version 2.1. The framework comprises a set of libraries that are available in source code as well as via executable installers and NuGet packages.