A preliminary version of the TsunamiClaw software is now available for solving the shallow water equations for wave propagation and inundation on arbitrary bathymetry. This software is still undergoing validation studies and should be viewed as research software. Use with care.
Written by David George, based on the AMRCLAW software for Adaptive Mesh Refinement written by Randy LeVeque and Marsha Berger.
As of July, 2008, TsunamiClaw is incorporated in Clawpack 5.0 as GeoClaw. The goal is to generalize this to apply to many other problems involving geophysical flows over topography or bathymetry.
See Tsunami research page for some other pointers.