Cao Thang is an researcher in Vietnam and Japan. His major is computer vision, machine learning and pattern recognition. Some of his free neural network applications are SPICE-MLP and SPICE-SOM. SPICE-SOM is a Self-Organizing Map Application. SPICE-MLP is an application of Three-Layer Neural Network with multi-inputs and outputs, written for students who wanted to learn and modeling various data.
Here is a link to his programs: http://download.cnet.com/windows/cao-thang