DeltaPlot

DeltPlot is a freeware that allows you to plot data directly within a standard ternary diagram. DeltaPlot can be used with any type of data, but the plot library (version 1.0, 30 plots) delivered with the software is especially suited for Earth sciences.

With DeltaPlot you can also create your own standard diagram, and send them to add them to future releases of the library. Exporting plots is as easy as drag and drop or copy paste.
What's new in this version:
A bug causing DeltaPlot to crash under Panther when no preference libraries were present was fixed. New plots contributed by users were added to the library Web page was updated