UnBBayes is a probabilistic network framework written in Java. It has both a GUI and an API with inference, sampling, learning and evaluation. It supports Bayesian networks, influence diagrams, MSBN, OOBN, HBN, MEBN/PR-OWL, PRM, structure, parameter and incremental learning.

Please, visit the license section of our wiki (https://sourceforge.net/p/unbbayes/wiki/License/) for more information about our licensing policy.


  • Bayes Net (or Bayesian network)
  • Influence Diagrams (or Decision Graphs)
  • MSBN (Multiple-Sectioned Bayesian Network)
  • OOBN (Object-Oriented Bayesian Network)
  • MEBN (Multi-Entity Bayesian Network)
  • PR-OWL (Probabilistic Web Ontology Language)
  • PR-OWL 2
  • UMP-ST (Uncertainty Modeling Process for Semantic Technologies)
  • Learning
  • Sampling and Simulation (e.g. Monte Carlo, Gibbs)
  • Metaphor
  • Approximate Inference
  • Data Mining
  • Plug-in Support
  • PRM (Probabilistic Relational Model)

Project Samples

Project Activity

See All Activity >

Follow UnBBayes

UnBBayes Web Site

Other Useful Business Software

Ranked ‘Best App’ Password Manager by Apple and Google Ranked ‘Best App’ Password Manager by Apple and Google Icon
Ranked ‘Best App’ Password Manager by Apple and Google Icon

Still writing down passwords? Or rotating between a handful that you can remember? Not safe! Get Dashlane, It’s FREE!

With all the accounts you have, remembering every single password is impossible. Dashlane protects your passwords and creates an easy, secure way to access all of your accounts on any device you own.

Rate This Project

Login To Rate This Project

User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5

User Reviews

  • This is a powerful probabilistic reasoning framework that incorporates a large number of techniques and algorithms. There are plugins for most if not all the major approaches for probabilistic systems, such as BNs, IDs, OOBNs, DBNs, PRMS, MEBNs, PR-OWL, and many others in a list that keeps growing. The learning curve is steep in many cases, which is expected in what is basically a research tool. It is hard to believe that such a powerful framework is freely available to everyone. Kudos for the dedicated team developing it in all their spare time.

  • The best open source package for working with PGMs. Supports decision nodes and utility nodes (unlike SamIam). Is open source (unlike Geany and SamIam). Many plugins for different things. However, I do wish that it implemented different inference algorithms, such as recursive conditioning and loopy belief propapagation, and had the ability to perform sensitivity analysis.

    3 users found this review helpful.
  • UnBBayes is a free and easy to use tool for Bayesian Networks. I am using it on my Master Thesis.

    1 user found this review helpful.
  • Just tried the newer (plugin based) version of unbBayes and glad to see the refinements. Ability to see the complete MTheory and do adjustments by dragging & resizing MFRag panels is cool.

    3 users found this review helpful.
  • I've been using UnBBayes for several years now, and it has come a long way. I am happy to have an implementation of MEBN. The changes over the past couple of years -- the GUI improvements, the plugin framework, the bug fixes have made it much better. I am really looking forward to seeing PR-OWL 2.0.

    2 users found this review helpful.
Read more reviews >

Additional Project Details


English, Brazilian Portuguese

Intended Audience

Financial and Insurance Industry, Healthcare Industry, Science/Research, Education, Developers, End Users/Desktop

User Interface

Java Swing

Programming Language