Gadget

GADGET is a free software for cosmological N-body/SPH simulations written by Volker Springel at the Max Planck Institute for Astrophysics. The name is an acronym of "GAlaxies with Dark matter and Gas intEracT". It is released under the GNU GPL.

A gadget is a small tool such as a machine that has a particular function, but is often thought of as a novelty. Gadgets are sometimes referred to as gizmos. Gizmos in particular are a bit different than gadgets. Gadgets in particular are small tools powered by electronic principles (a circuit board).