http://ic-www.arc.nasa.gov/ic/projects/bayes-group/group/autoclass/autoclass-c-program.html
Auto Class C is a public domain version of Auto Class III, with some
improvements from Auto Class X, implemented in the C language.
Auto Class is an unsupervised Bayesian classification system that seeks
a maximum posterior probability classification.
Inputs consist of a database of attribute vectors (cases), either real or discrete valued, and a class model. Default class models are provided. Auto Class finds the set of classes that is maximally probable with respect to the data and model. The output is a set of class descriptions, and partial membership of the cases in the classes. A DOS port is now available.
Note: This info converted from the original "The Data Mine" pages and pre-dates June 2001. Please remove this note if you update or check the info