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.