http://drambuie.lanl.gov/~bayes/tutorial.htm
Microsoft Belief Network Tools
Hugin Expert (Bayesian Networks)
International Society for Bayesian Analysis
The following links were found by a web search, using Alta Vista, with the search phrase "Naive Bayes". I selected the following links from the first 200 hits, out of a total of 331 hits.
MLC++ -- a library of C++ classes for supervised machine learning including a tool for Naive Bayes
The DBMS Guide to Data Mining Solutions including Naive Bayes
Exclusive Ore Inc. including Data Mining Product Features
Learning Bayesian Networks from Data -- slide show including slides 161-163 on Naive Bayes
Book by Weiss and Indurkhya "Predictive Data Mining" which includes Java software "Data-Miner Software Kit"
Second International Knowledge Discovery and Data Mining Tools Competition (1997 Competition jointly won by UCSD's BNB (Boosted Naive Bayes Classifier) software. Two out of top three competitors used Naive Bayes
KDD-99 -- ACM SIGKDD International Conference on Knowledge Discovery & Data Mining, 8/15/99 - 8/18/99, San Diego, CA USA (list of accepted papers)
Oracle Data Mining Suite (Oracle Darwin)
BAYDA 1.31 - Bayesian Predictive Discriminant Analysis
Paper on Tree Augmented Naive Bayes, by N. Friedman, D. Geiger, and M. Goldszmidt in Machine Learning 29:131--163, 1997. also see
Paper on Tree Augmented Naive Bayes, by N. Friedman and M. Goldszmidt in . Friedman and M. Goldszmidt In Thirteenth National Conf. on Artificial Intelligence (AAAI96).
Bayes Net Toolbox for Matlab 5