SPLASH is a free and open source visualisation tool for Smoothed Particle Hydrodynamics (SPH) simulations in one, two and three dimensions, developed mainly for astrophysics. It uses a command-line menu but data can be manipulated interactively in the plotting window.
Data is read *directly* from the code dump format giving rapid access to results and the visualisation is advanced forwards and backwards through timesteps by single keystrokes.
SPLASH uses the SPH kernel to render plots of density and other physical quantities, giving a smooth representation of the data. The goal is to eliminate the publication of crap-looking particle plots from SPH codes!