This is an interesting website: www.glazesimulator.com which is free. It helps to combine glaze analysis software with an empirical approach for both glaze properties and color effects.
Developed by Fraser Forsythe he comments “About 10 years ago I wrote software called glazesimulator and sold it for about three years. It was profiled in Ceramics Monthly along with Insight and Matrix. I found that most people really don’t like calculation or chemistry in the same sentence as creative or art. I thought, fair enough. There is a more empirical approach to making and testing glazes exemplified in a book like the Ceramic Spectrum. The website is an attempt to combine the two approaches.
My goal for the next year or so is to get the site out there and people going to it regularly. I would like to develop the site in conjunction with feedback I receive. The suggestions links on the site do not generate revenue. They are intended to send users to resources that would help in the learning and research process. It is worth a look I suggest and i am sure Fraser would welcome any feedback.