McDalton Learning Edition 1.0 (Latest release published in January 2008) is replaced by Molar Mass Calculator online. An application by the same author. The picture is a watercolor by Inger Andersson titled Molecules on a Swing.
McDalton Professional Edition 1.0 (Latest release published in January 2008) is replaced by Relative Molar Mass Calculator online. An application by the same author.
There are more applications for Chemists at Chemistry for Free.