Hank Murrow (http://www.murrow.biz/hank/)
Jon Singer's Jun Experiments (http://www.jonsinger.org/glazes/rutilejun.html)
Matrix (http://www.matrix2000.co.nz/)
GlazeChem (http://www.dinoclay.com/software/glzchem.html)
Clayart Archive (http://www.potters.org/categories.htm)