The Bayesian network editor is a stand alone application with the following features
Edit Bayesian network completely by hand, with unlimited undo/redo stack, cut/copy/paste and layout support.
Learn Bayesian network from data using learning algorithms in Weka.
Edit structure by hand and learn conditional probability tables (CPTs) using learning algorithms in Weka.
Generate dataset from Bayesian network.
Inference (using junction tree method) of evidence through the network, interactively changing values of nodes.
Viewing cliques in junction tree.
Accelerator key support for most common operations.
The Bayes network GUI is started as
java weka.classifiers.bayes.net.GUI <bif file>
The following window pops up when an XML BIF file is specified (if none is specified an empty graph is shown).