  This paper delivers a software -- libEMM -- for 3D controlled-source
electromagnetics (CSEM) modelling in fictitious wave domain, based on the newly
developed high-order finite-difference time-domain (FDTD) method on non-uniform
grid. The numerical simulation can be carried out over a number of parallel
processors using MPI-based high performance computing architecture. The FDTD
kernel coded in C has been parallelized with OpenMP for speedup using local
shared memory. In addition, the software features a GPU implementation of the
same algorithm based on CUDA programming language, which can be cross-validated
and compared in terms of efficiency. A perspective of libEMM on the horizon is
its application to 3D CSEM inversion in land and marine environment.
