ANUGA: open-source hydrodynamic modelling of floods, tsunamis and storm surges (shallow water equations, finite volumes). GPU/multicore solver developed with C-DAC (India) and NCI (Australia).
blitzdg is an open-source project aiming to implement parallel discontinuous Galerkin (dg) solvers for common partial differential equations systems using blitz++ for array and tensor manipulations and MPI for distributed parallelism.