Meep is a free finite-difference time-domain (FDTD) simulation software package to model electromagnetic systems. Meep is an acronym which officially stands for MIT Electromagnetic Equation Propagation. Its features include:

• Free and open-source software under the GNU GPL.
• Complete scriptability via Python, Scheme, or C++.
• Simulation in 1d, 2d, 3d, and cylindrical coordinates.
• Distributed memory parallelism on any system supporting the MPI standard. Portable to any Unix-like operating system such as Linux and macOS.
• Arbitrary anisotropic electric permittivity ε and magnetic permeability μ, along with dispersive ε(ω) and μ(ω) including loss/gain and nonlinear (Kerr & Pockels) dielectric and magnetic materials, and electric/magnetic conductivities σ.
• 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° rotations.
• Field output in the HDF5 standard scientific data format, supported by many visualization tools.
• Arbitrary material and source distributions.
• Field analyses including flux spectra, Maxwell stress tensor, frequency extraction, local density of states, arbitrary functions, near to far field transformations; completely programmable.

See the Meep manual on readthedocs for the latest documentation.

The latest official release can be found at the Meep download page.

To compile directly from a clone of the Meep git repository, you need to run

sh autogen.sh
make

in the cloned directory in order to generate the necessary files. You will need GNU autotools and SWIG installed, among other packages.