Where you go for

AForge.NET

Open source C# framework for computer vision and AI.

Apache SystemML

Scalable, flexible machine learning for big data environments

mlpack

Fast, flexible C++ machine learning library.

DecisionTree.jl

Decision tree and random forest machine learning for Julia.

DiffSharp

Automatic differentiation and tensor library for F# and .NET.

Patern Recognition and Machine Learning Toolbox

Matlab code library for algorithms from Pattern Recognition and Machine Learning.