ADDA is a C software package to calculate scattering and absorption of electromagnetic waves by particles of arbitrary geometry and composition using the discrete dipole approximation (DDA). Its main feature is the ability to run on a multiprocessor system or multicore processors (parallelizing a single DDA simulation). ADDA is intended to be a versatile tool, suitable for a wide variety of applications ranging from interstellar dust and atmospheric aerosols to biological particles; its applicability is limited only by available computer resources. As provided, ADDA should be usable for many applications without modification, but the program is written in a modular form, so that modifications, if required, should be fairly straightforward.

This software is available under GNU GPL 3. Full source code, Win32 binaries, and extensive manual are available.

• Link (26 Aug 2009)