There is also dbacl

Posted Feb 23, 2006 12:09 UTC (Thu) by pink18 (guest, #32445)
Parent article: The Grumpy Editor's guide to bayesian spam filters

dbacl - a digramic Bayesian classifier
http://dbacl.sourceforge.net/

I found this when I needed some filtering that was easy to integrate into a system for a single user. It is simple to build, install and use.