  We present an open-source software package, Vegas, for the atomistic
simulation of magnetic materials. Using the classical Heisenberg model and the
Monte Carlo Metropolis algorithm, Vegas provides the required tools to simulate
and analyze magnetic phenomena of a great variety of systems. Vegas stores the
history of the simulation, i.e. the magnetization and energy of the system at
every time step, allowing to analyze static and dynamic magnetic phenomena from
results obtained in a single simulation. Also, standardized input and output
file formats are employed to facilitate the simulation process and the exchange
and archiving of data. We include results from simulations performed using
Vegas, showing its applicability to study different magnetic phenomena.
