Spread is a user-friendly application to analyze and visualize phylogeographic reconstructions resulting from bayesian inference of spatio-temporal diffusion.

there is a tutorial for spread online at http://www.kuleuven.be/aidslab/phylogeography/tutorial/spread_tutorial.html

originally this program is named "spread". however, there is just such a package inside debian and thus a 'phy' for phylogeny was prepended.