SamIam is a great choice if you are looking for a tool to process Bayesian networks created by Primula. In fact, SamIam 3.0 and Primula are integrated. Therefore, it is easy to pipe the Bayesian network Primula outputs into SamIam.

The Primula system is a tool for probabilistic modeling of relational structures. It is a Java implementation of the language of Relational Bayesian Networks. Primula is distributed under the GNU general public license.