Accord.NET Framework - Machine learning, computer vision and statistics framework for .NET
FastCV Computer Vision - FastCV will enable you to add new user experiences into your camera-based apps like:
OpenCV - OpenCV is the world's biggest computer vision library
BoofCV - BoofCV is an open source library written from scratch for real-time computer vision.
Simple Photo Gallery - Simple Photo Gallery shows up your photos in an impressive and memorable way.
Scikit-learn - scikit-learn (formerly scikits.learn) is an open source machine learning library for the Python programming language.