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DDSUB a software package based on the Coupled-Dipole Method (CDM) for modeling the internal fields within a feature (defect) embedded below the surface of an infinite half-plane substrate. By Brent Nebeker.
Library with the filtered Green's tensor by Nicolas Piller.The filtered Green's tensor is a modified Green's tensor developed to improve the accuracy of the coupled-dipole approximation (CDA) or discrete-dipole approximation (DDA).
Reference:
N. B. Piller and O. J. F. Martin, Increasing the performance of the Coupled-Dipole Approximation: A spectral approach, IEEE Antennas and Propagation, August 1998.
Based on DDSCAT DDA_field adds the following additional capabilities to DDSCAT: (1) treatment of particles in solvent, (2) calculation of near-field properties such as local electric field, including the calculation of near-field properties on a grid that is different from the DDA grid, (3) periodic boundary conditions, (4) consideration of many other shapes of particles, and of more than one particle in the simulation box. DDA_field by Serdar Ogut and Juan C. Idrobo.
ADDA is a C software package to calculate scattering and absorption of electromagnetic waves by particles of arbitrary shape and composition using the discrete dipole approximation (DDA). The particles can be located in a homogeneous medium or near a plane substrate; emission (decay-rate) enhancement of point emitters can also be calculated. The main feature of ADDA is the ability to run on a multiprocessor system or multicore processors (parallelizing a single DDA simulation). It can also employ modern GPUs to accelerate computations. ADDA is intended to be a versatile tool, suitable for a wide variety of applications ranging from interstellar dust and atmospheric aerosols to metallic nanoparticles and biological cells. Its applicability is limited only by available computer resources.
This software is available under GNU GPL 3. Full source code, Windows binaries, and extensive documentation are available.

A preliminary, didactic, not tested, not documented, very simple, not for production, version of DDSCAT written in Matlab by Piotr J. Flatau.

Library with the filtered Green's tensor by Nicolas Piller.
The filtered Green's tensor is a modified Green's tensor developed to improve the accuracy of the coupled-dipole approximation (CDA) or discrete-dipole approximation (DDA).
Reference: N. B. Piller and O. J. F. Martin, Increasing the performance of the Coupled-Dipole Approximation: A spectral approach, IEEE Antennas and Propagation, August 1998.
Sample Fortran code used to produce overlapping mixture of multiple tetrahedra (OMMT) for use with DDSCAT by Yasuhiko Okada.
DDSCAT FORTRAN code by Draine and Flatau for scattering computation by 3d-objects.
Quasi-Monte-Carlo method (QMC) extending DDSCAT for efficient numerical orientation averaging of light scattering properties by Yasuhito Okada.

Discrete Dipole Approximation - Review and Advances by B. T. Draine and P. J. Flatau.
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