ChromaStar, by Dr. Ian Short of Saint Mary's University, models the atmospheres of stars--in your browser!
Dr Short has developed the following series of labs for ChromaStar.
Note that our installation is copy hosted by UW, but the original is documented and hosted at http://www.ap.smu.ca/~ishort/OpenStars/.
GSLab1-Color.docx: the Teff-colour relation
GSLab2-ExoPlanet1.docx: exo-planet life zones