Where you go for

Apache SystemML

Scalable machine learning for big data and distributed systems.

MLBase.jl

Fundamental tools for machine learning in Julia.

ml.js

Modular machine learning and statistical tools for the browser in JavaScript.

mlpack

Fast, flexible C++ machine learning library.

Apache SAMOA

Scalable machine learning for big data streams.

Naive Bayesian Classification for Golang

Naive Bayesian and TF-IDF classification library for Go.