AgenaRisk: This tool is unique among BBN tools in that it has a range of features to support building large models and is also the only BBN tool to handle continuous as well as discrete variables properly.
Other commercial BBN tools include Hugin and Netica.
Bayesian Knowledge Discoverer (BKD) is a computer program able to learn Bayesian Belief Networks (BBNs) from (possibly incomplete) databases. BKD is based on a new estimation method called Bound and Collapse and it has been developed within the Bayesian Knowledge Discovery project.