Meep (or meep) is a free finite-difference time-domain (fdtd) simulation software package developed at mit to model electromagnetic systems.

its features include:
* simulation in 1d, 2d, 3d, and cylindrical coordinates.
* distributed memory parallelism on any system supporting the mpi standard.
* dispersive (including loss/gain) and nonlinear (kerr & pockels) materials.
magnetic permeability and electric/magnetic conductivities.
* pml absorbing boundaries and/or perfect conductor and/or bloch-periodic
boundary conditions.
* exploitation of symmetries to reduce the computation size .
even/odd mirror symmetries and 90/180 degree rotations.
* complete scriptability - either via a scheme scripting front-end
(as in libctl and mpb), or callable as a c++ library.
* field output in the hdf5 standard scientific data format, supported by
many visualization tools.
* arbitrary material and source distributions.
* field analyses including flux spectra, frequency extraction, and energy
integrals; completely programmable.
* multi-parameter optimization, root-finding, integration, etcetera
(via libctl).
this package contains the mpi version of the software.