...the Metropolis-Hastings algorithm as a python class, and is extremely flexible and applicable to a large suite of problems. PyMC includes methods for summarizing output, plotting, goodness-of-fit and convergence diagnostics.
06-2008: Pebl is a python library and command line application for learning the structure of a Bayesian network given prior knowledge and observations.
This project contains two bayesian classifiers for Java: a Naive implementation and a Fishers implementation. It's merely a port from<sep/>
open source bayesian network toolbox for matlab
list of bayesian toolkits