Accord.NET Framework - Machine learning, computer vision and statistics framework for .NET
BoofCV - BoofCV is an open source library written from scratch for real-time computer vision.
ImageUltimate - Fastest and easiest ASP.NET Image Resizer
OpenCV - OpenCV is the world's biggest computer vision library
SimpleCV - SimpleCV is an open source framework for building computer vision applications.
libdwt - A software library for computation of the discrete wavelet transform that is primarily implemented...