  The (py)LIon package is a set of tools to simulate the classical trajectories
of ensembles of ions in electrodynamic traps. Molecular dynamics simulations
are performed using LAMMPS, an efficient and feature-rich program. (py)LIon has
been validated by comparison with the analytic theory describing ion trap
dynamics. Notable features include GPU-accelerated force calculations, and
treating collections of ions as rigid bodies to enable investigations of the
rotational dynamics of large, mesoscopic charged particles.
