Freeware is available

http://www.emsl.pnl.gov:2080/proj/neuron/neural/systems/shareware.html

http://www.emsl.pnl.gov:2080/proj/neuron/ci/systems/shareware.html

http://www.ncrg.aston.ac.uk/NN/software.html

http://www.mlnet.org/cgi-bin/mlnetois.pl/?File=software.html

http://http.cs.berkeley.edu/~murphyk/Bayes/software.html